This is a regression. The upstream comments say the bug was introduced after 6.2.6.1.
I can confirm it is present in 1:60.8.0+build1-0ubuntu0.19.04.1 but can be resolved by downgrading to thunderbird, thunderbird-locale-en, and xul-ext-lightning to 1:60.7.2+build2-0ubuntu0.19.04.1. ** Summary changed: - Lightning: Got a VALUE parameter with an illegal type for property: VALUE=DURATION + Lightning: Cannot dismiss reminders. Got a VALUE parameter with an illegal type for property: VALUE=DURATION -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1846423 Title: Lightning: Cannot dismiss reminders. Got a VALUE parameter with an illegal type for property: VALUE=DURATION To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/1846423/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs