I'm using Thunderbird for quite a while now and have successfully ported all my emails - some of them several years old - from my Windows7 setup to Ubuntu. My Thunderbird contains five different email accounts, one of which is a GoogleMail account using two-step-verification.
Now here's the problem: ever since updating to Ubuntu Precise 12.04, Thunderbird keeps forgetting my passwords. When trying to retrieve mails it states: 'login or password incorrect' for every single one of my accounts. I then chose to 're-enter password' and ticked the option to 'Use Password Manager to save password'. While this always worked, it never survived a logoff or reboot. I always had to reenter the same passwords after every logon again and again.
How can I force Thunderbird to actually remember my passwords forever?