Thunderbird not saving passwords on Ubuntu 18.04

I have 4 computers with Ubuntu 18.04 and in all 4, Thunderbird stopped saving credentials. Every time I open Thunderbird I have to enter passwords and/or OAuth2 authentication information and even when I do that, the Google account does not work. What can it be? Why is Thunderbird not saving this information in all 4 computers at the same time? I checked folder permissions but everything seems to be OK. The problems started yesterday and I haven't installed any Thunderbird updates.

For other accounts, it just asks for the password every time and apparently works fine until I close and open Thunderbird again.

Solution 1:

What worked for was: delete pkcs11.txt in profile

Taken from this: https://support.mozilla.org/nl/questions/1239779

Good luck!

Solution 2:

Thanks for your answers and the link above - worked for me!

The file 'pkcs11.txt' contains readable ASCII text and has an absolute path to the profile folder, which does not fit after moving the folder.

This was the case when I moved Thunderbird from Win7 to Linux! I renamed the original file, started Thunderbird again and compared the generated file with the renamed one. The diff tool showed only differences in that absolute path.