Unable to upgrade to elementaryOS 6 Odin

[colindean]

I built from the source with no changes. I ran a dry run and things seemed OK. Equipped with a fresh backup and snapshot (I'm in a Virtualbox VM), I ran with the safeties off and the upgrade failed. There are some package conflicts, apparently.

I found these instructions and followed them like so:

First, change /etc/apt/sources.list.d/elementary.list: anywhere it says "daily" change it to "stable" after running this io.elementary.upgrade tool.

sudo apt update
sudo apt full-upgrade -y --auto-remove
sudo apt install -f
sudo apt full-upgrade -y --auto-remove
sudo apt install -f
flatpak remote-add --system elementary https://flatpak.elementary.io/repo.flatpakrepo 
flatpak remote-add --user elementary https://flatpak.elementary.io/repo.flatpakrepo 
sudo apt purge -y --auto-remove screenshot-tool && flatpak install --system io.elementary.screenshot
flatpak search io.elementary --columns application | tail -n +1 | sort -u | xargs -i flatpak install --system -y app/{}/$(uname -m)/stable
flatpak install --system io.elementary.mail

Notes:

• Yes, needed a few iterations of those two commands.
• This may not result in a fully stable system.
• Some commands may have some failing output.

This got the system back up but now I cannot log in. When I enter my password at the greeter, I get a login error with an unhelpful: "Session returned error code 1". I'm dead in the water and I'll probably just reinstall: my home directory is on a separate vmdk so I can get back up and running pretty quickly.