Can confirm also on Ubuntu 18.04.
Related to bug 1726116?
** Changed in: thunderbird (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1809212
Title:
New
18.04 and GNOME.
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Title:
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Thank you for your bug report. What ubuntu version and desktop
environment do you use?
** Changed in: thunderbird (Ubuntu)
Importance: Undecided => Low
** Changed in: thunderbird (Ubuntu)
Status: New => Incomplete
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