A repository of things that fixed specific errors for me.

• Date: 2020-02-09

• Error:

  Feb 09 10:15:35 dc named[2913]: managed-keys-zone: Active key unexpectedly missing from .`  
  

  Fixed on Ubuntu 18.04.3 with:

  cd /var/cache/named
  sudo rm managed-keys.bind*
  sudo service bind9 restart

  Notes: I believe this error was harmless, but when something's not working right I like to try to get rid of as many error messages from the log as I can.

• Tags: ubuntu, 18.04.3, bionic beaver, named, bind9

• Date: 2020-07-14
• Error:

xsane failed to start scanner: invalid argument

Fixed on ubuntu 20.04 with:

rm -r ~/.sane

• Tags: ubuntu, 20.04, xsane, invalid argument

• Date: 2020-05-07

• Error:

  libtrace3/focal 3.0.21-1ubuntu3 amd64
  (pomodoneapp:38254): Pango-ERROR **: 08:34:06.746: Harfbuzz version too old (1.4.2)
  libtracker-control-2.0-dev/focal 2.3.4-1 amd64
  Trace/breakpoint trap (core dumped)
  jferg@quartz ~/Downloads $ 
  

  Fixed on Ubuntu 20.04 with:

  wget http://mirrors.kernel.org/ubuntu/pool/main/p/pango1.0/libpango-1.0-0_1.42.4-7_amd64.deb
  wget http://mirrors.kernel.org/ubuntu/pool/main/p/pango1.0/libpangocairo-1.0-0_1.42.4-7_amd64.deb
  wget http://mirrors.kernel.org/ubuntu/pool/main/p/pango1.0/libpangoft2-1.0-0_1.42.4-7_amd64.deb
  cd /opt/PomoDoneApp
  sudo dpkg -x libpango-1.0-0_1.42.4-7_amd64.deb .
  sudo dpkg -x libpangocairo-1.0-0_1.42.4-7_amd64.deb .
  sudo dpkg -x libpangoft2-1.0-0_1.42.4-7_amd64.deb .
  LD_LIBRARY_PATH=/opt/PomoDoneApp/usr/lib/x86_64-linux-gnu:$LD_LIBRARY_PATH ./pomodoneapp

  Notes: If you use gnome or KDE or another standard desktop you may want to edit the application descriptor in /usr/share/applications to include the LD_LIBRARY_PATH as well.

• Tags: ubuntu, 20.04, focal fossa, pango, pomodone, pomodoneapp, harfbuzz

• Date: 2020-05-10

• *Error:"

  $ steam 
  [2020-05-10 10:17:43] Nothing to do
  [2020-05-10 10:17:43] Verifying installation...
  [2020-05-10 10:17:43] Performing checksum verification of executable files
  [2020-05-10 10:17:44] Verification complete
  STEAM_RUNTIME_HEAVY: ./steam-runtime-heavy
  $ 
  

  On Ubuntu, the Steam client runs, installs updates, and then immediately exits. For me, this was an issue with not having DRI3 enabled in Xorg. To verify that this is your issue, run:

  $ grep "DRI" ~/.steam/root/error.log
  

  If it returns a line that looks something like:

  Error: No DRI3 support
  

  then this is probably your problem.

  Fixed on Ubuntu 20.04 by editing /etc/X11/xorg.conf to add the line:

    Option      "DRI" "3"
  

  to the "Intel Graphics" device section:

  Section "Device"
        Identifier  "Intel Graphics" 
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        Option      "DRI" "3"
  EndSection
  

• Tags: steam, ubuntu, 20.04, focal fossa, dri, dri3, crash, immediate exit, intel graphics