UPM showed few updates and when I clicked update all it has downloaded all and then started installing. But the process is not ending. I have restarted confluence 3 times but still same problem.
A couple of things you can check:
Let me know if it helps.
Joachim's approach is pretty solid, if that doesn't work, you can try this approach
UPM is bundled plugin of Confluence, so that could be corrupted, you can try to rebuild the bundled plugins, and for that, I suggest that you try this steps:
# Shutdown Confluence
Delete the content from the following folders:
# The _<confluence-home>/bundled-plugins_ folder
# The _<confluence-home>/plugin-cache_ folder
# The _<confluence-home>/plugins-osgi-cache_ folder
# Start Confluence
. I highly suggest that you schedule a downtime to do this approach.
I hope this do the work.
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