elementary OS – Odin

just fyi: inplace-upgrade is not officially supported, but

• install
  sudo apt install meson gettext libgranite-dev libgtk-3-dev libpolkit-gobject-1-dev valac
git clone https://github.com/meisenzahl/upgrade

cd upgrade
meson build --prefix=/usr
cd build
ninja test

sudo ninja install
io.elementary.upgrade

• –> needed two passes (first pass upgraded current system to last version) –>
• upgrade failed: DON’T Reboot – run –>
  sudo apt --fix-broken install
• now reboot system
• check sources.list (and sources.list.d/*) for wrong additional package sources (i.e. ms-packages still pointing to 18.04)

after upgrade

• system freezes –> /var/log/syslog showed problems with my nvidia card and the os-driver –> after installation of proprietary nvidia driver system seems to be stable
• as fallback I installed openssh-server

sudo apt-get install ssh-import-id
sudo apt-get install openssh-server

• AppCenter looks empty after migration to Odin. To get additional apps you need to install your first flatpack i.e. run
  sudo apt install flatpak
  followed by i.e.
  sudo flatpak install flathub com.microsoft.Teams
• now you can install/add packages through built-in AppCenter