Update manager stuck in update

It is safe to kill update-manager, but after that please run the following:

sudo dpkg --configure -a
sudo apt-get install -f
sudo apt-get update && sudo apt-get upgrade

I ran into the same issue, and found a solution that worked for me based on: linuxquestions.org

Execute the following commands:

ps -e | grep apt

And then:

sudo kill -9 <pid>

For each apt/aptd pid reported.

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