Falc's questions

I have the Sennheiser pxc550-ii bluetooth headphones that I want to pair with my Ubuntu 20.04 desktop and have aptx-hd and aptx-ll codecs working. Its worth noting regarding the latter that I've installed this ppa. Its also worth noting that I can pair using bt to my bt speakers just fine.

I've tried using the default bloothtooth tool as well as blueman-manager. In both I can see the headphones in the list of available bluetooth devices, but both just fail to pair.

Then I turned to following this guide, the output of the commands they suggest are:

1st command:

jam@jam-ncase:~$ lsmod | grep bluetooth
bluetooth             454656  49 btrtl,btintel,btbcm,bnep,btusb,rfcomm
ecdh_generic           16384  2 bluetooth
rfkill                 28672  11 asus_wmi,bluetooth,cfg80211
crc16                  16384  2 bluetooth,ext4

2nd command:

jam@jam-ncase:~$ dmesg | grep Bluetooth
[    2.285152] Bluetooth: Core ver 2.22
[    2.285162] Bluetooth: HCI device and connection manager initialized
[    2.285165] Bluetooth: HCI socket layer initialized
[    2.285166] Bluetooth: L2CAP socket layer initialized
[    2.285168] Bluetooth: SCO socket layer initialized
[    2.302897] Bluetooth: hci0: read Intel version: 3707100180012d0d2a
[    2.302898] Bluetooth: hci0: Intel device is already patched. patch num: 2a
[    2.354229] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    2.354230] Bluetooth: BNEP filters: protocol multicast
[    2.354232] Bluetooth: BNEP socket layer initialized
[    6.314639] Bluetooth: RFCOMM TTY layer initialized
[    6.314643] Bluetooth: RFCOMM socket layer initialized
[    6.314646] Bluetooth: RFCOMM ver 1.11

3rd command:

● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
     Active: active (running) since Wed 2020-08-26 09:01:38 BST; 5min ago
       Docs: man:bluetoothd(8)
   Main PID: 6075 (bluetoothd)
     Status: "Running"
      Tasks: 1 (limit: 19076)
     Memory: 1.9M
     CGroup: /system.slice/bluetooth.service
             └─6075 /usr/lib/bluetooth/bluetoothd

Aug 26 09:01:38 jam-ncase bluetoothd[6075]: Bluetooth management interface 1.16 initialized
Aug 26 09:01:38 jam-ncase bluetoothd[6075]: Endpoint registered: sender=:1.47 path=/MediaEndpoint/A2DPSource/VENDOR/LDAC
Aug 26 09:01:38 jam-ncase bluetoothd[6075]: Endpoint registered: sender=:1.47 path=/MediaEndpoint/A2DPSource/VENDOR/APTXHD
Aug 26 09:01:38 jam-ncase bluetoothd[6075]: Endpoint registered: sender=:1.47 path=/MediaEndpoint/A2DPSource/VENDOR/APTX
Aug 26 09:01:38 jam-ncase bluetoothd[6075]: Endpoint registered: sender=:1.47 path=/MediaEndpoint/A2DPSource/AAC
Aug 26 09:01:38 jam-ncase bluetoothd[6075]: Endpoint registered: sender=:1.47 path=/MediaEndpoint/A2DPSource/SBC
Aug 26 09:01:38 jam-ncase bluetoothd[6075]: Endpoint registered: sender=:1.47 path=/MediaEndpoint/A2DPSink/VENDOR/APTXHD
Aug 26 09:01:38 jam-ncase bluetoothd[6075]: Endpoint registered: sender=:1.47 path=/MediaEndpoint/A2DPSink/VENDOR/APTX
Aug 26 09:01:38 jam-ncase bluetoothd[6075]: Endpoint registered: sender=:1.47 path=/MediaEndpoint/A2DPSink/AAC
Aug 26 09:01:38 jam-ncase bluetoothd[6075]: Endpoint registered: sender=:1.47 path=/MediaEndpoint/A2DPSink/SBC

4th:

jam@jam-ncase:~$ rfkill list
0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

I've noticed this error message as well:

jam@jam-ncase:~$ pactl load-module module-bluetooth-discover
Failure: Module initialisation failed

The terminal output when I try and pair/connect can be found here.One line that stands out from that file is this one:

> HCI Event: Disconnect Complete (0x05) plen 4             #56 [hci0] 25.099314
        Status: Success (0x00)
        Handle: 256
        Reason: Remote Device Terminated due to Power Off (0x15)

My headphones are definitely power on though. Would someone be able to advise on how I should try and fix this?

I'm using simple-scan with a Brother DCP-L2530DW printer/scanner. The printer works fine, but I'm having issues using the scanner.

I've installed the drivers:

jam@jam-ncase:~$ sudo dpkg -l | grep Brother
[sudo] password for jamie: 
ii  brscan-skey                                0.2.4-1                                amd64        Brother Linux scanner S-KEY tool
ii  brscan4                                    0.4.8-1                                amd64        Brother Scanner Driver
ii  dcpl2530dwpdrv:i386                        4.0.0-1                                i386         Brother DCP-L2530DW printer driver (lpd/cups)
ii  printer-driver-brlaser                     5-1                                    amd64        printer driver for (some) Brother laser printers
ii  printer-driver-ptouch                      1.4.2-3                                amd64        printer driver Brother P-touch label printers

When I start simple-scan, it says Ready to Scan - Brother DCP-L2530DW.

But when I click scan, the scanning animation starts, but then an error message pops up saying: Failed to scan, unable to connect to scanner.

I've googled the problem, and the things I've tried are:

• add my user to lp

• Running this command: sudo cp /usr/lib64/sane/libsane-brother* /usr/lib/x86_64-linux-gnu/sane

user@ncase:~$ flatpak list
Ref                                                  Options       
org.DolphinEmu.dolphin-emu/x86_64/stable             system,current
org.freedesktop.Platform.GL.nvidia-396-54/x86_64/1.4 system,runtime
org.freedesktop.Platform.ffmpeg/x86_64/1.6           system,runtime
org.freedesktop.Platform/x86_64/1.6                  system,runtime
org.gtk.Gtk3theme.Adapta-Eta/x86_64/3.22             system,runtime
org.kde.Platform/x86_64/5.11                         system,runtime
org.kde.Platform/x86_64/5.9                          system,runtime
user@ncase:~$ flatpak list --app
Ref                                      Options       
org.DolphinEmu.dolphin-emu/x86_64/stable system,current
user@ncase:~$ flatpak uninstall 

As you can see, I only have 1 flatpak app installed, but I have a lot of flatpak runtimes installed. Are they safe to uninstall, or are they still in use somehow?

I have enabled the Nvidia graphics driver ppa and I have the 390 drivers installed.

I am trying to upgrade to the 396 drivers but I am running into difficulties.

The normal way I've installed the nvidia graphics drivers is by installing the package named 'nvidia-390'. The first thing I noticed is that there isn't a package called 'nvidia-396'. However there is a package called 'nvidia-driver-396'. When I try and install that however I get the following error message.

jamie@jamie-ncase:~$ sudo apt install nvidia-driver-396
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
 nvidia-driver-396 : Depends: nvidia-dkms-396 (= 396.54-0ubuntu0~gpu18.04.1) but it is not going to be installed
                     Depends: libnvidia-decode-396 (= 396.54-0ubuntu0~gpu18.04.1) but it is not going to be installed
                     Depends: libnvidia-encode-396 (= 396.54-0ubuntu0~gpu18.04.1) but it is not going to be installed
                     Depends: nvidia-utils-396 (= 396.54-0ubuntu0~gpu18.04.1) but it is not going to be installed
                     Depends: xserver-xorg-video-nvidia-396 (= 396.54-0ubuntu0~gpu18.04.1) but it is not going to be installed
                     Depends: libnvidia-cfg1-396 (= 396.54-0ubuntu0~gpu18.04.1) but it is not going to be installed
                     Depends: libnvidia-fbc1-396 (= 396.54-0ubuntu0~gpu18.04.1) but it is not going to be installed
                     Recommends: libnvidia-decode-396:i386 (= 396.54-0ubuntu0~gpu18.04.1)
                     Recommends: libnvidia-encode-396:i386 (= 396.54-0ubuntu0~gpu18.04.1)
                     Recommends: libnvidia-ifr1-396:i386 (= 396.54-0ubuntu0~gpu18.04.1)
                     Recommends: libnvidia-fbc1-396:i386 (= 396.54-0ubuntu0~gpu18.04.1)
                     Recommends: libnvidia-gl-396:i386 (= 396.54-0ubuntu0~gpu18.04.1)
E: Unable to correct problems, you have held broken packages.

The thing is i'm pretty sure I don't have broken packages unless I try and install this new driver: I can run 'sudo apt update' and 'sudo apt dist-upgrade' no problem, both run fine.

I'm trying to set the CPU governor to performance in 18.04, the problem is that it never survives reboots.

I've tried following these steps in an answer to this question How to set "Performance" instead of "Powersave" as default? but when I reboot the computer the CPU governor switches back to powersaver.

I've also tried creating a file called /etc/rc.local with the line:

cpupower frequency-set --governor performance

That also doesn't survive reboots.

How can I do this?

How do I automount a LUKS encrypted partition in a secure way? Ideally either when I log on (and therefore my password in at the log in screen), or once I get to desktop have Ubuntu ask for my password and then auto mount the partition?

The contents of my fdisk is below

The encrypted partition is /dev/sdb7, my root and home partition is /dev/sdb5 (which isn't encrypted).

Disk /dev/loop0: 14 MiB, 14647296 bytes, 28608 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop1: 81.7 MiB, 85692416 bytes, 167368 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x0006d9d9

Device     Boot     Start        End    Sectors   Size Id Type
/dev/sda1            2048  524646399  524644352 250.2G  7 HPFS/NTFS/exFAT
/dev/sda2  *    524646400 1953523711 1428877312 681.4G 83 Linux


Disk /dev/sdb: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x1ffae910

Device     Boot     Start       End   Sectors   Size Id Type
/dev/sdb1       214892542 976773119 761880578 363.3G  5 Extended
/dev/sdb2  *         2048   2150399   2148352     1G 83 Linux
/dev/sdb5       214892544 257558559  42666016  20.4G 83 Linux
/dev/sdb6       300716032 318294015  17577984   8.4G 82 Linux swap / Solaris
/dev/sdb7       318296064 976773119 658477056   314G 83 Linux

Partition table entries are not in disk order.

Encryptfs has been removed from 18.04, in favour of full disk encryption (LUKS). See here for confirmation. This means that my current set up of having an encrypted home directory on a different partition is harder to replicate.

Basically, I like to have two OS partitions (sdb5 and sdb6), that both have their encrypted /home directories on a different partition (sdb8), because it makes it easier to distro-hop.

How can I set this up, all within an encrypted LUKS container, when installing ubuntu from a livecd?

I want to replicate this set up within a LUKS container:

So I've installed Java 8 via PPA using this method: http://tecadmin.net/install-oracle-java-8-jdk-8-ubuntu-via-ppa/

And it seems to be working:

jamie@jamie-ncase:/media/fa7e62a0-92d8-4af6-86d9-bdf5a38e786a/Steam/steamapps/common/Medieval II Total War/share/data/mods/ebii$ java -version
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)
jamie@jamie-ncase:/media/fa7e62a0-92d8-4af6-86d9-bdf5a38e786a/Steam/steamapps/common/Medieval II Total War/share/data/mods/ebii$ 

I've tried to start my java file (wf_switcher.jar) by double clicking on it, but nothing happens so I am trying to open the file through terminal to see whats going wrong.

When I try and run a java .jar file I get this error:

jamie@jamie-ncase:/media/fa7e62a0-92d8-4af6-86d9-bdf5a38e786a/Steam/steamapps/common/Medieval II Total War/share/data/mods/ebii$ java wf_switcher.jar
Error: Could not find or load main class wf_switcher.jar
jamie@jamie-ncase:/media/fa7e62a0-92d8-4af6-86d9-bdf5a38e786a/Steam/steamapps/common/Medieval II Total War/share/data/mods/ebii$ javac wf_switcher.jar
error: Class names, 'wf_switcher.jar', are only accepted if annotation processing is explicitly requested
1 error

And I don't know why it isn't working. Can anyone help?