Yes, you can install Evolution and delete the u1 contact list from there. Afterwards, Thunderbird will no longer attempt to use that addressbook, and will therefore not complain about it either. When you're done with it, you can savely remove Evolution again if you don't want it.
Yes, you can install Evolution and delete the u1 contact list from there. Afterwards, Thunderbird will no longer attempt to use that addressbook, and will therefore not complain about it either. When you're done with it, you can savely remove Evolution again if you don't want it.