I'm also running into this problem, which appeared after the Ubuntu upgrade,
which switched thunderbird from .deb to a snap package.
In the dmesg output I see several apparmor messages concerning thunderbird. I'm
not sure which of them -- if any -- relates to the issue, but I strongly
suspect
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: thunderbird (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2067340
Title:
I have also tried setting Thunderbird's settings for Files & Attachments
to "Use /bin/okular". The pdf files are still not opened.
As a workaround, I can save the pdf files and then open them with
okular. But WHY do I have to do this in a roundabout way? It used to
"just work" seamlessly!
--
** Package changed: linux (Ubuntu) => thunderbird (Ubuntu)
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https://bugs.launchpad.net/bugs/2067340
Title:
can't open pdfs
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