[Bug 2080536] Re: package thunderbird (not installed) failed to install/upgrade: new thunderbird package pre-installation script subprocess returned error exit status 1

[Sebastien Bacher]

Thank you for your bug report. It seems a snapd or store problem

> error: cannot perform the following tasks:
- Fetch and check assertions for snap "thunderbird" (509) (cannot verify sna
p "thunderbird", no matching signatures found)

** Package changed: thunderbird (Ubuntu) => snapd (Ubuntu)

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Title:
  package thunderbird (not installed) failed to install/upgrade: new
  thunderbird package pre-installation script subprocess returned error
  exit status 1

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