I'm really new in Ubuntu or Linux as well. I'm wanting to install Google Chrome, so I went to Chrome homepage and downloaded a .deb file. I opened it with Software Install and hit Install. Then I saw a process called "Waiting to install" in Launcher bar. But it has been stuck for a couple of hours now. I tried rebooting and installing it again 3 times but still got this problem. I researched and knew this is a bug when installing by Software Install. So I decided to install via terminal and Chrome was installed successfully. Now I can open Chrome and surf the net. But the "Waiting to install" process is still there. I don't want to reboot to get rid of it. That is not a good way and I also don't believe there is no other software out there acts like that. So what I want to do now is I want to kill it. But I opened the System Monitor and didn't have a clue which PID it is. So please tell me how to kill it like an Ubuntu professor.
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Type xkill
in Terminal and the cursor should turn into a "×". Place it over the malfunctioning window and click.

pomsky
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Another post here shares a related issue, if not the same, and the work around suggested is simply to install the .deb file straight from the terminal. TBH, that's the way I almost always do it myself: go to the terminal, and type:
cd /path/to/file
sudo dpkg -i google-chrome-stable_current_amd64.deb
sudo apt -f install
...last line to fix any dependency issues that may arise; not necessary if you the dpkg command runs without any dependency issues.

anonymous2
- 4,298
sudo apt update
and thensudo apt full-upgrade
. – Jan 08 '18 at 18:46