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Ubuntu fixes and tricks

that I was storing in a .txt file somewhere. I'll leave it in monospace because that's how I formatted it as plain text. I might make it prettier later, but I doubt it. 
      FIXES:

      run sudo 'lshw -C network' to check status of wireless driver
        fix: install bcmwl-kernel-source and follow instructions

      install vim and vim-gtk (to get clipboard support)
      run 'dmesg' to check bluetooth status
        fix: copy the related firmware file to /lib/firmware/brcm
        from the winterheart/broadcom-bt-firmware GIT repository.
        source:
        https://www.nielsvandermolen.com/bluetooth-headphones-ubuntu/
      for headset microphone not working:
        change pulseaudio for pipewire
        source:
        https://askubuntu.com/questions/831331/failed-to-change-profile-to-headset-head-unit

      something about ubuntu bluetooth
      https://dev-pages.info/ubuntu-bluetooth/

      if system insists on using external microphone when plugging
      headphones in (even when there is none) one solution is installing
      hdajackretask from alsa-tools-gui and overriding the mic jack to Not
      Connected. Read documentation.
      Note: Supposedly it's not good to run hdajackretask with sudo.

      texlive:
      make sure there is no texlive installed
      install texlive from texlive website
      softly symlink tlmgr, pdflatex and latexmk
        from /usr/local/texlive/20XX/bin/x86_64-linux
        to /usr/local/bin

      indicator stickynotes

      enable "use autoscrolling" in firefox

      install vim-plug (requires curl and git, see instructions at github)
      configure vimtex and ultisnips (See Guilles Castel guide)

      my vimrc includes
      set tw=70 tabstop=2 shiftwidth=2 expandtab number

      download gnome-tweaks to customize screenshots folder
      add shortcuts
      for full screenshot: gnome-screenshot
      for area screenshot: gnome-screenshot -a
      for terminal at path: gnome-terminal --working-directory="/path"

      for mp3 and mp4 etc, install ubuntu-restricted-extras

      Fix opera:
        install the chromium-ffmpeg from snap and link one of the
        libffmpeg.so files to opera, for example
        sudo ln -s /snap/chromium-ffmpeg/XX/chromium-ffmpeg-XXXXX/chromium-ffmpeg/libffmpeg.so /usr/lib/x86_64-linux-gnu/opera/

      To restart open tablet driver and make sure gnome is not interfering
      systemctl --user restart opentabletdriver
      removed xserver-xorg-input-wacom
      http://bolide.run/Wiki/FAQ/Linux

      OTHER TRICKS

      extract pages from pdf:
      pdftk full-pdf.pdf cat 12-15 output outfile_p12-15.pdf

      analyze startup times:
      systemd-analyze blame

      shell version: $SHELL --version

      add pulse-audio sinks:
      pactl load-module module-null-sink sink_name=MySink
      pactl load-module module-loopback sink=MySink
      pactl unload-module

      convert png to pdf:
      mogrify -format pdf -units PixelsPerInch *png
      one can specify density with -density
        if this doesn't work, edit /etc/ImageMagick-6/policy.xml of
        ImageMagick-6. In that file, change the policy rights to read/write
        
        change to
        

      merge pdf files using ghost script:
      gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -dAutoRotatePages=/None -sOutputFile=finished.pdf  file1.pdf file2.pdf

      rotate pdf +90 or -90 degrees:
      pdftk input.pdf cat 1-endwest output output.pdf
      pdftk input.pdf cat 1-endeast output output.pdf

      convert mp4 to ogg
      ffmpeg -i input.mp4 -codec:v libtheora -qscale:v 3 -codec:a libvorbis \
        -qscale:a 3 -f ogv output.ogv

      bulk conversion of webp to png:
      find . -name "*.webp" | xargs -I {} dwebp {} -o {}.png

      webm to mp4:
      ffmpeg -i video.webm video.mp4

      youtube-dl -x --audio-format vorbis -a lista

      | xargs -I {} program "{}"

      tree -f -a > salida.txt

      make git store username and password forever:
      git config --global credential.helper store

      make git store username and password for a session:
      git config --global credential.helper cache

      .bash_profile and .bashrc are specific to bash, whereas .profile is
      read by many shells in the absence of their own shell-specific config
      files. (.profile was used by the original Bourne shell).
      .bash_profile or .profile is read by login shells, along with .bashrc;
      subshels read only .bashrc

      zbarimg is a command line tool that can read qr codes
      one can find it in the ubuntu package called zbar-tools