This is similar to Thunderbird upgrade to snap (24.04.1) - won't open with original profile - how to correct?
I was not allowed to post this on that thread, so am trying a new one.
I'm trying to understand this situation. I just upgraded from 22.04 to 24.04. During the process, a dialog box came up saying that I would have to use snap for Thunderbird. This was in a primitive gui style. I clicked yes. The 24.04 installation eventually had problems and was aborted, though it said the overall upgrade succeeded. I rebooted into a root shell and I think the command was 'apt --fix-broken upgrade'. It worked. And everything seems to be OK except Thunderbird, which gave me the "Your profile cannot be loaded ..." message. This box is dual booted with Win11. My profile in $HOME/.thunderbird is a link to a directory in an NTFS file system visible to Windows. I can boot into Windows and use its Thunderbird fine. Both Windows and Linux have been kept up-to-date with the latest versions of Thunderbird that came from the OS vendors' update process.
Poking around, it looks like some version of this profile was copied into /snap. Mention was made of an upgrade tool in a message in this thread that I apparently was supposed to know about. Searching now on the internet, I don't see anything that appears to be relevant about that. I have a full backup of the disk made just before the upgrade. I use IMAP. All my many messages are stored locally. I have tried using the profile command-line options when starting up Thunderbird, to no avail. These problems don't make sense to me. Has Ubuntu effectively dropped support for Thunderbird having dual boot capabilities?
