Joachim's questions

I'm running Ubuntu 20.04 and wants a VM with another install of Ubuntu to try out some stuff.

I've installed VirtualBox as describes on their website (added ppa) and followed this post on how to install it.

When I try to boot it up I get a popup saying the following:

So... I've tried to search the forum, but like this post they doesn't describe their problem in detail and the last post doesnt seem to be my problem. I have 16 GB of ram.

However when I look into the logs I see that there's a problem reading the ISO and the VM Disk:

00:00:00.794924 VirtualBox VM 6.1.18 r142142 linux.amd64 (Jan  7 2021 17:36:17) release log
00:00:00.794926 Log opened 2021-02-27T10:46:27.374821000Z
00:00:00.794926 Build Type: release
00:00:00.794929 OS Product: Linux
00:00:00.794930 OS Release: 5.8.0-44-generic
00:00:00.794931 OS Version: #50~20.04.1-Ubuntu SMP Wed Feb 10 21:07:30 UTC 2021
00:00:00.794947 DMI Product Name: 20KFCTO1WW
00:00:00.794952 DMI Product Version: ThinkPad X280
00:00:00.794957 Firmware type: UEFI
00:00:00.795549 Secure Boot: Enabled
00:00:00.795583 Host RAM: 15760MB (15.3GB) total, 10827MB (10.5GB) available
00:00:00.795586 Executable: /usr/lib/virtualbox/VirtualBoxVM
00:00:00.795586 Process ID: 27519
00:00:00.795587 Package type: LINUX_64BITS_UBUNTU_19_10
00:00:00.806297 Installed Extension Packs:
00:00:00.806323   None installed!
00:00:00.807016 Console: Machine state changed to 'Starting'
00:00:00.807171 Qt version: 5.12.8
00:00:00.807192 X11 Window Manager code: 2
00:00:00.810712 SUP: seg #0: R   0x00000000 LB 0x0004c000
00:00:00.810778 SUP: seg #1: R X 0x0004c000 LB 0x00114000
00:00:00.810823 SUP: seg #2: R   0x00160000 LB 0x0005f000
00:00:00.810831 SUP: seg #3: RW  0x001bf000 LB 0x00035060
00:00:00.812782 SUP: Loaded VMMR0.r0 (/usr/lib/virtualbox/VMMR0.r0) at 0xXXXXXXXXXXXXXXXX - ModuleInit at XXXXXXXXXXXXXXXX and ModuleTerm at XXXXXXXXXXXXXXXX
00:00:00.812819 SUP: VMMR0EntryEx located at XXXXXXXXXXXXXXXX and VMMR0EntryFast at XXXXXXXXXXXXXXXX
00:00:00.814081 Guest OS type: 'Ubuntu_64'
00:00:00.815672 fHMForced=true - No raw-mode support in this build!
00:00:00.819263 GUI: UIMediumEnumerator: Medium-enumeration finished!
00:00:00.820811 X Server details: vendor: The X.Org Foundation, release: 12009000, protocol version: 11.0, display string: :0
00:00:00.820842 Using XKB for keycode to scan code conversion
00:00:00.821575 File system of '/home/joachim/Downloads/ubuntu-20.04.2.0-desktop-amd64.iso' (DVD) is unknown
00:00:00.823308 GUI: UIDesktopWidgetWatchdog::sltHandleHostScreenAvailableGeometryCalculated: Screen 0 work area is actually resized to: 48x27 x 1872x1053
00:00:00.826613 File system of '/home/joachim/VirtualBox VMs/Ubuntu Eoan/Snapshots' (snapshots) is unknown
00:00:00.826651 File system of '/home/joachim/VirtualBox VMs/Ubuntu Eoan/Ubuntu Eoan.vdi' is unknown
00:00:00.838188 Shared Clipboard: Service loaded
00:00:00.838223 Shared Clipboard: Mode: Off
00:00:00.838267 Shared Clipboard: Service running in normal mode
00:00:00.838949 Drag and drop service loaded
00:00:00.838972 Drag and drop mode: Off
00:00:00.840708 ************************* CFGM dump *************************

Lines like these:

00:00:00.826651 File system of '/home/joachim/VirtualBox VMs/Ubuntu Eoan/Ubuntu Eoan.vdi' is unknown

I've tried to install the extension pack without any luck.

My host system uses ZFS. Could this be related?

Anyone else experienced this and maybe solved it somehow?

Today my instance of Ubuntu Core crashed completely, and it wont boot anymore. I do not have anything important on it, but I've been strugglig for a while that the machine kept freezing and I had to do a hard reboot by unplugging the power.

To do some debugging it would be interesting to check the filesystem for logs. However, when I plug in the SD-card in my laptop, only the «system boot» partition shows up. The filesystem for storage shows up as «unknown» in Gparted, and it's not any options to mount it.

Anyone knows how I can mount the other filesystem?

My SD-cards won't mount automatically anymore. In the past it did, also on Ubuntu 18.04, but now when returning from my summer holiday and upgraded the system it won't anymore.

Anyone knows a trick? Now i need to open «Disks» (gnome-disks?) and then manually mount each partition on the card, or with sudo mount /dev/mmcblk0pX /mount/destination. It's more convenient when it's mounted automatically.

First:

Distributor ID: Ubuntu
Description:    Ubuntu 16.04.3 LTS
Release:    16.04
Codename:   xenial
Linux <hostname> 4.4.0-112-generic #135-Ubuntu SMP Fri Jan 19 11:48:36 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

I'm trying to start an instance of an application as a «user service» systemctl --user start <service>. But when I'm issuing this command (or any other systemctl --user-commands) I'll get an error saying

Failed to connect to bus: No such file or directory

It doesn't matter if I'm issuing this command as the root user or a normal user, but what I eventually want's is to run this as a normal user.

I have searched online and tried everything I can come across. One problem that many people with similar problems have mentioned is that $XDG_RUNTIME_DIR and $DBUS_SESSION_BUS_ADDRESS is not set for the environment; and Yes, it isn't in my case either, but the solution on setting them haven't helped me.

I have tried to set them after login and in .profile (also tried to reboot), but nothing helps.

Some mentioned that logging in to the user from the root-user (su - <username>) could also cause these problem, but the solutions here was to simply log in directly through SSH with the normal-user. But unfortunately it doesn't work either in my case.

Anyone with a suggestion on how I can get this working?

Yes. There is a reason why I want/need this for a particular user (or several), without giving it/them full root access.

I've tried to get the mir-kiosk snap on Ubuntu Core, on a Raspberry Pi 3, running. Installation progress went fine, using these two tutorials; * http://voices.canonical.com/alan.griffiths/2017/01/31/mircade-snap/ * http://www.lieberbiber.de/2017/02/27/mir-and-graphics-on-ubuntu-core/

One person has made a comment about it working flawlessly on Raspberry Pi 3, but it doesn't on my side. I've tried the suggested "snap connection" without any luck.

I don't get any error messages. Have tried many reboots and reinstalls.

Any suggestions?

The pi have both Ethernet and WiFi connection. Connected to a 40 TV through HDMI.

I'm trying to figure out where to place the configuration files for wireless networks for NetworkManager in Ubuntu Core.

Anyone having an idea? I've looked through /snap/NetworkManager and /home/user/snap/NetworkManager, but none of the folders inside these looks familiar to the folder structure from within /etc/NetworkManager on a server distribution.

I'm using 16.04 on my computer, and want's to use 16.04 on my rasperry pi 2 as well. I'm trying to copy the data over to the Micro SD card, with the command xzcat ubuntu.img.xz | sudo dd of=/dev/mmcblk0 as suggested on the website https://wiki.ubuntu.com/ARM/RaspberryPi, but it seems to take very long time (60 minutes +) and I suspect it to be something wrong. When I installed 14.04 (un-official) it didn't taker more than a few minutes to copy into the SD-card.

I have checked that my SD is identified as /dev/mmcblk0 and it is unmounted from the system. Have tried to delete every partitions on the card as well (with Gparted), to ensure nothing is mounted somewhere with a mistake.

RPi's own documentation suggest somehow a litle different command, but since the img on Ubuntu's website is compressed (img.xz) I think I need to xzcat the content first, and therefore cant use the command from RPi.

Have also tried to change the bs option, but that doesn't seem to speed up anything. I'm on my fourth try, now with bs=32M as suggested here, but doesn't seem to change much other than it started on 1,3 GB instead of a few MB when I didn't specify bs.

This is output from sudo pkill -USR1 -n -x dd

0+157946 records in
0+157946 records out
1348820992 bytes (1,3 GB, 1,3 GiB) copied, 58,5943 s, 23,0 MB/s
0+157948 records in
0+157948 records out
1349099520 bytes (1,3 GB, 1,3 GiB) copied, 72,1942 s, 18,7 MB/s
0+157951 records in
0+157951 records out
1349386240 bytes (1,3 GB, 1,3 GiB) copied, 86,1943 s, 15,7 MB/s
0+157984 records in
0+157984 records out
1353392128 bytes (1,4 GB, 1,3 GiB) copied, 263,002 s, 5,1 MB/s
0+158055 records in
0+158055 records out
1359421440 bytes (1,4 GB, 1,3 GiB) copied, 384,202 s, 3,5 MB/s
0+158210 records in
0+158210 records out
1373396992 bytes (1,4 GB, 1,3 GiB) copied, 628,222 s, 2,2 MB/s
0+160165 records in
0+160165 records out
1443610624 bytes (1,4 GB, 1,3 GiB) copied, 1085,44 s, 1,3 MB/s
0+163605 records in
0+163605 records out
1562771456 bytes (1,6 GB, 1,5 GiB) copied, 1593,89 s, 980 kB/s

Running version 12.04, with Virtualmin/Webmin.

I tried to remove all unnecessary linux-image files today, since the /boot partition was full. I followed a guide from Ask Ubuntu, but that resulted in a broken Grub, or something, probably because the command in the suggested guide removed more than it should have.

After several hours I finally managed to install a new kernel image, and created a new Grub, but then I found out that all files in the directory /run were deleted and probably several other files/directories, that were related to those packages in that directory. I don't know how that could've happened, but I knew there was something strange already when I booted into the Recovery Mode, since I couldn't find any link to the symlink /etc/resolv.conf --> /run/resolvconf/resolv.conf.

Anyway: I have a complete backup of my filesystem, that was made today with the rsync command (sudo rsync -ahe ssh ..., options: --delete --exclude=.gvfs --exclude=/proc --exclude=/dev --exclude=/sys) .

I tried to restore just the /run directory, without any luck.

My question is then: can I just replace all files on my server, with the files on my backup-location, with the same rsync command? (Yes, I know I have to swap "source" and "destination" in the command)

In case that it is possible, is there anything else I should do afterwards?