When installing third party applications in Ubuntu / Linux Mint, one needs to specifically first add the PPAs (Personal Packaging Archives) and then install the related required applications.
Now over a course of time, it may happen that these added PPAs may become obsolete or are simply no longer existent. This will cause errors when updating Linux Mint/Ubuntu systems as the updates won’t be installed successfully because of these problematic PPAs.
Here is how to quickly remove them and ensure that the Ubuntu/Linux Mint system receives and installs regular updates for it’s stability :
First, list the available PPAs from repository by typing the following in Terminal :
Next, remove the unwanted PPA (it is advisable to remove those PPAs which can no longer be updated or not existing anymore, the update manager in Linux Mint/Ubuntu will display the related errors for those when attempting a system update).
Remove using the following command :
Once removed, make sure to update the repository again by :