Starting a new profile works, though.
But that's not a very convenient upgrade method. :-)
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Packages, which is subscribed to thunderbird in Ubuntu.
Thunderbird 45.3 failed to be built for Yakkety
Status in thunderbird package in Ubuntu:
Thunderbird is stuck at version 45.2 on Yakkety's proposed repository.
Packages for all archs failed to build. It should be v. 45.3 as Xenial's
packages. Additionally, there is a security notice :
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