Hi Mark,
It seems that you have problem installing and uninstalling due to 3rd
party.
Do one thing, run the following commands:
1. ps afx|grep dpkg [To check if this process is running].
2. If there is any process, then kill with sudo killall dpkg
3. Remove the file using sudo rm /var/lib/dpkg/lock-frontend
After this :
1. Go to system settings.
2. Go to Software& Updates.
3. Click on Other Software.
4. Remove all 3rd party repositories.
5. Run sudo apt-get update && sudo apt-get install -f && sudo apt-get update
Then check if you are able to install or uninstall anything.
** Changed in: qt4-x11 (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1816047
Title:
Can't install or uninstall any application
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