====== Ubuntu 18.04 -> 20.04 upgrade ======

<code>
sudo do-release-upgrade -d
</code>
Kodi-specific: keep pam config, keep security/limits config, resolved.conf blacklist.conf /etc/sysctl.conf openssh server conf  unattended upgrades mysqld.conf apticron


remove unnecessary locales
<code>
list available locales:
localedef --list-archive
locale -a
</code>
then remove all BUT THE ONES LISTED:
<code>sudo locale-gen --purge <locales YOU WANT TO KEEP> en_GB.utf8 en_US.utf8</code>

<code>sudo apt-get install localepurge</code>
After that, you could reboot or try to run ''. /etc/default/locale''.

To reconfigure this, simply enter the following in terminal:
<code>sudo dpkg-reconfigure localepurge</code>

reinstate ppas after upgrade by uncommenting sources  https://askubuntu.com/questions/111645/whats-the-best-way-to-re-enable-ppas-repos-after-an-upgrade

<code>for f in /etc/apt/sources.list.d/*.list; do sudo sed -i 's/bionic/focal/g' $f; sudo sed -i 's/^# \(.*\) # disabled on upgrade to.*/\1/g' $f;done</code>

Remove snap/lxd:
<code>
sudo apt autoremove --purge snapd gnome-software-plugin-snap
</code>

Remove legacy xorg drivers, keep only intel
<code>
sudo apt-get purge xserver-xorg-video-vmware xserver-xorg-video-radeon xserver-xorg-video-qxl xserver-xorg-video-nouveau xserver-xorg-video-intel-hwe-18.04 xserver-xorg-video-ati xserver-xorg-video-amdgpu xserver-xorg-legacy-hwe-18.04 xserver-xorg-legacy xserver-xorg-video-all xserver-xorg-hwe-18.04 xserver-xorg-core-hwe-18.04 xserver-xorg-video-fbdev xserver-xorg-video-vesa xserver-xorg-video-intel
</code>

remove edid firmware patch and update initramfs and grub
<code>
vi /etc/default/grub
</code>
set
<code>
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
</code>
<code>
sudo update-grub
</code>

<code>
sudo apt-get install xserver-xorg-legacy xserver-xorg-video-intel
</code>
#set to everyone
<code>
sudo dpkg-reconfigure xserver-xorg-legacy
</code>
<code>
sudo vi /etc/X11/Xwrapper.config
</code>
add
<code>
needs_root_rights=yes
</code>

Adjust Alsa options:
<code>
sudo vi /etc/modprobe.d/alsa-base.conf
</code>
<code>
#options snd-hda-intel enable_msi=1 bdl_pos_adj=1,48
options snd-hda-intel power_save=0 power_save_controller=N
</code>
 OR
<code>
sudo echo -e '\n# Disable snd-hda-intel power saving\noptions snd-hda-intel power_save=0 power_save_controller=N\n' >> /etc/modprobe.d/alsa-base.conf
</code>

Reinstall virtualbox (if required):
<code>
sudo apt install virtualbox virtualbox-qt
</code>

Install tortoisehg (if required):
https://askubuntu.com/questions/1182598/how-to-install-tortoisehg-on-ubuntu-19-10
https://askubuntu.com/questions/1232173/how-to-install-the-tortoisehg-in-ubuntu20-04
<code>
mkdir ~/temp 2>/dev/null
cd ~/temp
sudo apt install python-is-python3
python --version
sudo apt install -y python3-pip build-essential
sudo apt install -y mercurial
hg clone https://bitbucket.org/tortoisehg/thg/ -r stable
hg clone https://foss.heptapod.net/mercurial/tortoisehg/thg -r stable
cd thg
pip3 install pyqt5
pip3 install qscintilla
sudo apt install -y pyqt5.qsci-dev
pip3 install mercurial
sudo apt install -y python3-iniparse
make local
cd ~/temp
rm -rf ~/tortoisehg 2>/dev/null
mkdir ~/tortoisehg
mv thg/* ~/tortoisehg
vi ~/.local/share/applications/tortoisehg.desktop
pip3 install qscintilla
sudo apt-get install python3-pyqt5.qsci
</code>

Keepass2:
<code>
sudo apt-get install --reinstall keepass2
sudo apt-get install --reinstall keepass2-plugin-tray-icon keepass2-plugin-libimagemagick keepass2-plugin-libdbus
</code>