[Bug 1860330] Re: After upgrading from Eoan to Focal, I receive the error: "A newer version of Thunderbird may have made changes to your profile which are no longer compatible with this older version. Use this profile only with that newer version, or create a new profile for this installation of Thunderbird. Creating a new profile requires setting up your accounts, calendars and add-ons again."

[Sean Sosik-Hamor]

I see to have found a workaround:

ubuntu at friendly:/usr/bin$ ./thunderbird -allow-downgrade

Users shouldn't need to manually run this. Chatter from the below Web
pages says:

mahmacc said:
> The instruction to change to the Thunderbird installation directory and then run the command as ./thunderbird.... is not necessary for Linux users whose paths are set up so the command above will work.)

Matt said:
> Hmm, and who has their path set correctly.  My experience is that the more people need help the less likely they are to even know what a path is.  That is certainly the case on Windows where very few appear to even have heard of the path.  It is still there and works like it always did.  But the user base of windows has no idea.


References:

 * https://support.mozilla.org/en-US/questions/1276736
 * https://thunderbirdtweaks.blogspot.com/2019/09/i-lost-my-profilemail-on-update-to.html

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Title:
  After upgrading from Eoan to Focal, I receive the error: "A newer
  version of Thunderbird may have made changes to your profile which are
  no longer compatible with this older version. Use this profile only
  with that newer version, or create a new profile for this installation
  of Thunderbird. Creating a new profile requires setting up your
  accounts, calendars and add-ons again."

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