[Bug 1901829] Re: thunderbird fails to open, xml parse error

[Olivier Tilloy]

Right, so the trigger for the bug appears to be upgrading from
thunderbird 68.x to 78.y, as Joep did by enabling the ubuntu-mozilla-
security PPA.

Note that that PPA is not recommended for general use, it is used for
preparing and testing updates. This doesn't invalidate this problem
though, which I haven't managed to reproduce in various testing
scenarios yet.

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Title:
  thunderbird fails to open, xml parse error

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