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Re:Thunderbird 78.x is great but has issues for advanced PGP... by iam-TJ on Friday November 27, 2020 @04:21AM (#25226881)
If you need to prevent upgrade in Debian, Ubuntu, and other Debian package based distros add a version hold in apt's preferences by creating a 'pin' on the current version:

  /etc/apt/preferences.d/thunderbird68

  Package: thunderbird
  Pin: version 1:68.*
  Pin-Priority: 1000
Re:Thunderbird 78.x is great but has issues for advanced PGP... by Thoughtful on Friday November 27, 2020 @04:30AM (#25226952)
How would you later remove the pin?
Re:Thunderbird 78.x is great but has issues for advanced PGP... by inetknght on Friday November 27, 2020 @04:33AM (#25226971)
Just like climbing a tree, the best way down is usually the inverse of the way you got up.

If you added a version pin by adding a file... then remove the version pin by removing the file.