I downloaded libnss3-1d_3.12.6-0ubuntu0.9.10.2_i386.deb from https://launchpad.net/~ubuntu-mozilla-security/+archive/ppa/+build/1685696 and now Thunderbird will launch without the security error. I was not having the problem with Firefox, only Thunderbird.
Note: I did not have libnss3-0d installed, only 1d.
I downloaded libnss3- 1d_3.12. 6-0ubuntu0. 9.10.2_ i386.deb from https:/ /launchpad. net/~ubuntu- mozilla- security/ +archive/ ppa/+build/ 1685696 and now Thunderbird will launch without the security error. I was not having the problem with Firefox, only Thunderbird.
Note: I did not have libnss3-0d installed, only 1d.