lurscher's questions

I've been trying to setup Ubuntu server (current attempt with 18.04.3) to receive LUKS passphrase from dropbear, I was mostly successful, but then I tried a few things to get the passphrase from dropbear to unlock also the other LUKS drives that have the same passphrase, long story short, everything went to hell and now when I boot, dropbear ssh client fails with

 lastlog_perform_login: Couldn't stat /var/log/lastlog: No such file or directory
 lastlog_openseek: /var/log/lastlog is not a file or directory!
 sed: /conf/conf.d/cryptroot: No such file or directory

on the host, I get dropped into a busybox shell which doesn't have cryptsetup installed

Things I've tried:

I booted into the installer image in live mode, manually mounted and unlock root partition, then chrooted into it, trying to modify stuff in /etc/initramfs-tools/ and rerunning update-initramfs -u, when doing this I get a line that the /etc/crypttab line that contains the UUID of the root partition is invalid, but is not clear what is the problem, as I haven't changed anything in /etc/crypttab

I've rebooted several times, but no success

I also tried uninstalling cryptsetup and initramfs-tools and reinstalling into the chroot, but doesn't fix anything

I want to setup this again, but not sure how to do this properly from the chrooted environment, what can I try now?

I am using Kubuntu 18.04.1 and I am unable to find where to set options for screen locking or screen saver.

Version of KDE framework:

I am trying to do juju bootstrap lxd lxd-local but it fails with the following error:

Select a cloud [localhost]: 

Enter a name for the Controller [localhost-localhost]: 

Resolved LXD host address on bridge lxdbr0: 10.122.27.1:8443
no credentials found, checking environment
Adding contents of "/home/lurscher/.local/share/juju/ssh/juju_id_rsa.pub" to authorized-keys
Creating Juju controller "localhost-localhost" on localhost/localhost
Loading image metadata
Looking for packaged Juju agent version 2.2.5 for amd64
Starting new instance for initial controller
To configure your system to better support LXD containers, please see: https://github.com/lxc/lxd/blob/master/doc/production-setup.md
Launching controller instance(s) on localhost/localhost...
 - juju-5d7c6c-0 (arch=amd64)          
Fetching Juju GUI 2.10.2
Waiting for address
ERROR failed to bootstrap model: waited for 20m0s without getting any addresses

I am running kubuntu 17.04, juju version 2.2.5-zesty-amd64, both lxd and lxc are version 2.19

While stuck in the waiting for address message, I dumped the contents of /var/log/cloud-init.log and it is in this pastebin link.

On the other hand, /var/log/cloud-init-output.log only has a line:

lxc exec juju-a9264f-0 cat /var/log/cloud-init-output.log
Cloud-init v. 0.7.9 running 'init-local' at Wed, 25 Oct 2017 23:50:41 +0000. Up 1.00 seconds.

consider the following code for a dynamic loaded library built with g++-4.7 on linux, -fPIC and linked with -rdynamic option:

typedef std::vector< void* > cbRegister_t;

struct Wrapper
{
    cbRegister_t instance;
    Wrapper() : instance() { HDebugLog("Wrapper CTOR!");}
    ~Wrapper() { HDebugLog("Wrapper DESTRUCTOR!"); }
};
inline cbRegister_t& getLibraryUnregisterMap()
{
    static Wrapper unregisterLibraryMap;
    HDebugLog("getLibraryUnregisterMap: we have " <<unregisterLibraryMap.instance.size() << " elements. the address of the map is " << &unregisterLibraryMap.instance);
    return unregisterLibraryMap.instance;
}

void registerLibrary(void* p)
{
  auto& map = getLibraryUnregisterMap();
  map.push_back(p);
}

void unregisterLibrary()
{
  auto& map = getLibraryUnregisterMap();
}

void __attribute__ ((constructor)) library_init()
{
  static SomeData cbContainer;
  HDebugLog("Library constructor: address of static cbContainer is: " << &cbContainer );
  registerLibrary( &cbContainer);
} 
void __attribute__ ((destructor)) library_fini()
{ unregisterLibrary(); }

This code loads fine from a client with dlopen and the RTLD_NOW flag. The library constructor is called. The problem happens when i call dlclose on the handle. It gives status zero, meaning that it was successful. But the library destructor library_fini is not called. dlopen is called on a single place so the reference count should not be a problem, but in order to be absolutely sure that there are really no references dangling i tried doing the dlclose several times:

int result = dlclose(handle);
HDebugLog("Library::dynamicLibraryClose: closing library: " << libraryPath);
HDebugLog("Library::dynamicLibraryClose: dlclose 1 failed with error: " << result << " => " );
result = dlclose(handle);
HDebugLog("Library::dynamicLibraryClose: dlclose 2 failed with error: " << result << " => " );
result = dlclose(handle);
HDebugLog("Library::dynamicLibraryClose: dlclose 3 failed with error: " << result << " => " );
result = dlclose(handle);
HDebugLog("Library::dynamicLibraryClose: dlclose 4 failed with error: " << result << " => " );
result = dlclose(handle);
HDebugLog("Library::dynamicLibraryClose: dlclose 5 failed with error: " << result << " => " );
result = dlclose(handle);
HDebugLog("Library::dynamicLibraryClose: dlclose 6 failed with error: " << result << " => ");
result = dlclose(handle);
HDebugLog("Library::dynamicLibraryClose: dlclose 7 failed with error: " << result << " => ");
result = dlclose(handle);
HDebugLog("Library::dynamicLibraryClose: dlclose 8 failed with error: " << result << " => " );
HAssertMsg( !libraryPath.empty(), "library path is not set");
HAssertMsg( 0 == dlopen(libraryPath.c_str(), RTLD_NOLOAD) , "library is still loaded");

All those debug logs show that each time i call dlclose the status result is zero. Success!

The last assertion, which doesn't fail, confirms that the library is not resident anymore . But at this point library_fini has not been called yet!

This behavior is definitely a bug, either on gcc or ld.so (or whatever is using linux/ubuntu to dynamically load libraries these days). This behavior clearly is not what the standard says, because library destructors should be guaranteed to be run if the reference count is zero before dlclose returns. library destructors happen to be run after the Wrapper.instance is destroyed, which renders the library destructor completely useless, as is not able to do any finalization of the data

I'm in the process of porting some applications from Maverick 10.10 to Precise 12.04. Some of the system headers do not seem to be in the same place. This is giving me some headaches since it doesn't seem to matter that i add the include paths.

In particular, on Maverick, there was a file in /usr/include/sys/ucontext.h, and this file defines the constant REG_EIP. Now, on Precise, this file has moved to /usr/include/x86_64-linux-gnu/sys/ucontext.h, but g++ 4.6 nor 4.7 have that include path:

`gcc -print-prog-name=cc1plus` -v
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/4.6
 /usr/include/c++/4.6/x86_64-linux-gnu
 /usr/include/c++/4.6/backward
 /usr/lib/gcc/x86_64-linux-gnu/4.6/include
 /usr/local/include
 /usr/lib/gcc/x86_64-linux-gnu/4.6/include-fixed
 /usr/include
End of search list.

the consequence of this is that when including #include <ucontext.h>, REG_EIP is not defined

I've tried adding #include <sys/ucontext.h> but i still get the error:

error: 'REG_EIP' was not declared in this scope

Any idea how to fix this?

Since LXC (Linux Containers) is a kernel level super-chroot, I've been wondering what sort of video driver the containers have:

My host is Ubuntu 12.04 64-bit machine with ATI gpu. Will the LXC container have access to the same driver? Or do they need to be installed on each container?

I have ubuntu 12.04 64-bit system, when i run glxinfo i see some strange error about indirect rendering and failed to load some lib32/dri/swrast_dri libraries.

Any idea what is going on?

please let me know if i can enhance the relevant information provided in this question

$ LIBGL_DEBUG=verbose glxinfo
name of display: :0
libGL: screen 0 does not appear to be DRI2 capable
libGL: OpenDriver: trying /usr/lib32/dri/tls/swrast_dri.so
libGL: OpenDriver: trying /usr/lib32/dri/swrast_dri.so
libGL error: dlopen /usr/lib32/dri/swrast_dri.so failed (/usr/lib32/dri/swrast_dri.so: cannot open shared object file: No such file or directory)
libGL: OpenDriver: trying /usr/lib/dri/tls/swrast_dri.so
libGL: OpenDriver: trying /usr/lib/dri/swrast_dri.so
libGL error: dlopen /usr/lib/dri/swrast_dri.so failed (/usr/lib/dri/swrast_dri.so: cannot open shared object file: No such file or directory)
libGL error: unable to load driver: swrast_dri.so
libGL error: reverting to indirect rendering
display: :0  screen: 0
direct rendering: No (If you want to find out why, try setting LIBGL_DEBUG=verbose)
server glx vendor string: ATI
server glx version string: 1.4
server glx extensions:
    GLX_ARB_multisample, GLX_EXT_import_context, GLX_EXT_texture_from_pixmap, 
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_OML_swap_method, 
    GLX_SGI_make_current_read, GLX_SGI_swap_control, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
client glx extensions:
    GLX_ARB_create_context, GLX_ARB_create_context_profile, 
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context, 
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_EXT_framebuffer_sRGB, 
    GLX_EXT_create_context_es2_profile, GLX_MESA_copy_sub_buffer, 
    GLX_MESA_multithread_makecurrent, GLX_MESA_swap_control, 
    GLX_OML_swap_method, GLX_OML_sync_control, GLX_SGI_make_current_read, 
    GLX_SGI_swap_control, GLX_SGI_video_sync, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, 
    GLX_EXT_texture_from_pixmap, GLX_INTEL_swap_event
GLX version: 1.4
GLX extensions:
    GLX_ARB_get_proc_address, GLX_ARB_multisample, GLX_EXT_import_context, 
    GLX_EXT_visual_info, GLX_EXT_visual_rating, 
    GLX_MESA_multithread_makecurrent, GLX_OML_swap_method, 
    GLX_SGI_make_current_read, GLX_SGI_swap_control, GLX_SGIS_multisample, 
    GLX_SGIX_fbconfig, GLX_SGIX_pbuffer, GLX_SGIX_visual_select_group, 
    GLX_EXT_texture_from_pixmap
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: AMD Radeon HD 6800 Series 
OpenGL version string: 1.4 (2.1 (4.2.11762 Compatibility Profile Context))
OpenGL extensions:
    GL_ARB_depth_texture, GL_ARB_draw_buffers, GL_ARB_fragment_program, 
    GL_ARB_fragment_program_shadow, GL_ARB_framebuffer_object, GL_ARB_imaging, 
    GL_ARB_multisample, GL_ARB_multitexture, GL_ARB_occlusion_query, 
    GL_ARB_point_parameters, GL_ARB_point_sprite, GL_ARB_shadow, 
    GL_ARB_shadow_ambient, GL_ARB_texture_border_clamp, 
    GL_ARB_texture_compression, GL_ARB_texture_cube_map, 
    GL_ARB_texture_env_add, GL_ARB_texture_env_combine, 
    GL_ARB_texture_env_crossbar, GL_ARB_texture_env_dot3, 
    GL_ARB_texture_mirrored_repeat, GL_ARB_texture_non_power_of_two, 
    GL_ARB_texture_rectangle, GL_ARB_transpose_matrix, GL_ARB_vertex_program, 
    GL_ARB_window_pos, GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color, 
    GL_EXT_blend_equation_separate, GL_EXT_blend_func_separate, 
    GL_EXT_blend_minmax, GL_EXT_blend_subtract, GL_EXT_copy_texture, 
    GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_framebuffer_blit, 
    GL_EXT_framebuffer_multisample, GL_EXT_framebuffer_object, 
    GL_EXT_multi_draw_arrays, GL_EXT_packed_pixels, GL_EXT_point_parameters, 
    GL_EXT_rescale_normal, GL_EXT_secondary_color, 
    GL_EXT_separate_specular_color, GL_EXT_shadow_funcs, GL_EXT_stencil_wrap, 
    GL_EXT_subtexture, GL_EXT_texture3D, GL_EXT_texture_compression_s3tc, 
    GL_EXT_texture_edge_clamp, GL_EXT_texture_env_add, 
    GL_EXT_texture_env_combine, GL_EXT_texture_env_dot3, GL_EXT_texture_lod, 
    GL_EXT_texture_lod_bias, GL_EXT_texture_mirror_clamp, 
    GL_EXT_texture_object, GL_EXT_texture_rectangle, GL_EXT_vertex_array, 
    GL_ATI_draw_buffers, GL_ATI_texture_env_combine3, 
    GL_ATI_texture_mirror_once, GL_ATIX_texture_env_combine3, 
    GL_IBM_texture_mirrored_repeat, GL_INGR_blend_func_separate, 
    GL_NV_texture_rectangle, GL_SGIS_generate_mipmap, 
    GL_SGIS_texture_border_clamp, GL_SGIS_texture_edge_clamp, 
    GL_SGIS_texture_lod, GL_SGIX_shadow_ambient, GL_SUN_multi_draw_arrays

However, i did a search for that library and it is somewhere else:

$ locate swrast_dri.so
/usr/lib/x86_64-linux-gnu/dri/swrast_dri.so

When i run xprop -id <wid> on a given windows id for an opengl application (Ubuntu 12.04) i get a bunch of properties, but i don't see _NET_WM_PID;

$ xprop -id 0x4a00002 
_NET_WM_ICON_GEOMETRY(CARDINAL) = 0, 488, 64, 65
XKLAVIER_STATE(INTEGER) = 0, 0
_NET_WM_FULLSCREEN_MONITORS(CARDINAL) = 4294967295, 1852143205, 19456, 1645412352
_NET_WM_STATE(ATOM) = 
WM_STATE(WM_STATE):
        window state: Normal
        icon window: 0x0
_NET_FRAME_EXTENTS(CARDINAL) = 1, 1, 28, 1
_NET_WM_DESKTOP(CARDINAL) = 0
_NET_WM_ALLOWED_ACTIONS(ATOM) = _NET_WM_ACTION_MOVE, _NET_WM_ACTION_RESIZE, _NET_WM_ACTION_FULLSCREEN, _NET_WM_ACTION_MINIMIZE, _NET_WM_ACTION_SHADE, _NET_WM_ACTION_MAXIMIZE_HORZ, _NET_WM_ACTION_MAXIMIZE_VERT, _NET_WM_ACTION_CHANGE_DESKTOP, _NET_WM_ACTION_CLOSE, _NET_WM_ACTION_ABOVE, _NET_WM_ACTION_BELOW
WM_PROTOCOLS(ATOM): protocols  WM_DELETE_WINDOW
WM_LOCALE_NAME(STRING) = "C"
WM_HINTS(WM_HINTS):
        Initial state is Normal State.
WM_NORMAL_HINTS(WM_SIZE_HINTS):
        user specified location: 50, 50
        user specified size: 640 by 480
WM_CLIENT_MACHINE(STRING) = "gliese-581h"
WM_ICON_NAME(STRING) = "Full-Screen & Windowed Mode"
WM_NAME(STRING) = "Full-Screen & Windowed Mode"

how do i access the process pid associated to the window id?

Possible Duplicate:
How to get Ubuntu installed after deleting Windows and with no other OS present?

I downloaded an image of 12.04 and I want to burn it onto a CD.

Apparently each time I boot to the 10.10 LiveCD and try to burn the image using the default application (Brasero disc burner), when I replace the LiveCD with the empty CD, the system freezes.

What do I need to do so the system doesn't freeze and lets me burn my image?

Possible Duplicate:
Why is more than 3GB of RAM not recognised when using amd64?
Why does Ubuntu only show 3GB of RAM?

my ubuntu 10.10 x64 was installed on this box one year ago, with 6Gb of ram.

recently i've noticed that system monitor reports just 3.9GiB for memory. That can't possibly be right (in windows i'm having access to the full 6Gb of ram on the same machine)

any idea what might be happening?

EDIT

uname -m
x86_64

 free -m
             total       used       free     shared    buffers     cached
Mem:          3954       1802       2151          0         53       1014
-/+ buffers/cache:        735       3219
Swap:         5721          0       5721

I have Ubuntu 10.10 x86_64 with Nvidia 9800 gt and Nvidia driver version 270.41.06

My video card has two DVI sockets, but I only use the single monitor configuration. Now, I think the main DVI socket might be busted, so I want to try to enable the other as the main one, however, I don't know how to achieve that. I tried just plugging the monitor in that socket but it won't auto-detect it (it would have been way too easy to just work).

This is my xorg.conf:

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection


Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"

    # HorizSync source: builtin, VertRefresh source: builtin
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "AOC"
    HorizSync       31.5 - 84.7
    VertRefresh     60.0 - 78.0
    ModeLine       "1080p" 172.8 1920 2040 2248 2576 1080 1081 1084 1118 -hsync +vsync
    Option         "DPMS"
EndSection


Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 9800 GT"
EndSection

Section "Screen"

# Removed Option "metamodes" "1024x768 +0+0"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "CustomEDID" "CRT-0:/home/charlesq/lg.bin"
    Option         "TVStandard" "HD1080p"
    Option         "TwinView" "0"
    Option         "TwinViewXineramaInfoOrder" "CRT-0"
    Option         "metamodes" "1080p +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

I was just installing updates for 10.10 amd_64 Ubuntu desktop guest system, but the system seems to have frozen while applying changes, going into host-F1 terminals doesn't work.

If I do a hard reset of the virtual machine, what sort of manteinance/recovery operation should I do? Any apt-get commands I should do to rollback the installation/obtain more info of the problem?

I want to access virtual consoles in my Ubuntu guests running VirtualBox with Ubuntu guest. However, even if the focus is within the guest window, if I press Ctrl+F1 thru F6 I move in a virtual terminal of the host, not the guest.

How do I switch to a virtual terminal in the guest OS?

Recently the game braid was released for ubuntu in the ubuntu software center. however, it seems they don't take payments from paypal yet. Is there a political reason for this, or a technical one?

i want to install lamp-server in ubuntu 10.10 (the end goal is to install redmine), i am using

sudo tasksel install lamp-server

However after downloading packages it asks for a root password for mysql, now, in my machine i have already an instance of MariaDB 5.24 and i want it to use that (not download or install real mysql), what do i need to do in order to properly configure it with the right database?

thanks

How do I update a single package? As far as man apt-get says apt-get upgrade doesn't take a package/list of packages as parameter:

upgrade

upgrade is used to install the newest versions of all packages currently installed on the system from the sources enumerated in /etc/apt/sources.list. Packages currently installed with new versions available are retrieved and upgraded; under no circumstances are currently installed packages removed, or packages not already installed retrieved and installed. New versions of currently installed packages that cannot be upgraded without changing the install status of another package will be left at their current version. An update must be performed first so that apt-get knows that new versions of packages are available.

i've made the mistake of installing firefox flash plugin, which is horribly buggy, unstable and leaky. I need to banish this piece of rubbish out of my precious ubuntu workstation. I tried this by doing

sudo apt-get remove flashplugin-installer

but that just removes the installer, not the library

what package do i need to remove to completely uninstall this?

I've installed ubuntu 10.10 x86_64 desktop version, which defaults to Xorg login

I want to temporarily switch this machine to server mode, basically i "suspect" this entails setting to runlevel 3 and headless mode somewhere

what are the details of this? Also very important is how do i re enable desktop mode again?