A few days ago I ran the update manager to see if there were any new updates to be downloaded. There were some updates, so I clicked the Download button. Once it finished, it asked me to install them as usual. However, it seems to be a problem with one specific update. The update manager starts installing it, but the progress bar stays for hours in the middle of the progress and a message appears in the details.

This is the update information before installing.


And these are the details that show up while installing.


After that, I tried to reboot the computer, but as you can see, the problem has not been solved by itself.


It seems that update manager waits for user input while showing changelog of the unattended-upgrades package. You can try to press q while it is shown.

Otherwise you should try to fix this manually from terminal:

sudo apt update
sudo apt upgrade

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