On Ubuntu 19.04 run the following command to fix it (downgrading):
sudo apt install \
gir1.2-mutter-4=3.32.0+git20190410-1ubuntu1 \
libmutter-4-0=3.32.0+git20190410-1ubuntu1 \
mutter=3.32.0+git20190410-1ubuntu1 \
mutter-common=3.32.0+git20190410-1ubuntu1
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https://bugs.launchpad.net/bugs/1834583
Title:
[eoan][regression] GNOME Shell hangs when closing a Java dialog; hung
in (varying functions under) meta_stack_get_default_focus_window()
from meta_window_x11_focus()
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https://bugs.launchpad.net/mutter/+bug/1834583/+subscriptions
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