No, it is from the official Puros repo
Notice the top corner
@arvamircea Running sudo apt remove mrpt-apps will solve your problem
You are right, it did solve all my problems. How did you figure out that that the app is called mrpt-apps?
[FEATURE REQUEST] Put the package name in the PureOS Store.
It was the only one that I did not have of the apps in your list; I looked at the details(in Puros Store) for cameracalib and saw that it mentioned mrpt; and @shopping4purism mentioned it earlier.