I’m testing Fedora KDE 41 for viability on my current system. (I’m currently on LinuxMint 22.1, have been using it for several years with success but interested in moving to Fedora and KDE.) I’m only running the live image at this time while testing.
Many things are working fine but an attempt to add the printer fails with:
Failed to configure printer: The printer-uri "ipp://liveuser@localhost:631/printers/MF741C/743C" contains invalid characters.
From “Printers - System Settings”, it finds the printer without issue. Trying both listed options (“via DNS-SD” and “via IPP”) and both listed drivers for each option, all return with the same error shown above when I click [Add]. Currently, under LM22.1 I am using the IPP option and I’m able to find and add the printer, and print without issue.
Could this just be an artifact of running the live image? I wouldn’t think so given the error message but maybe it isn’t accurate to what is actually happening?
It is possible to reinstall rpm packages, like CUPS-related ones, on live images. You just have to be prepared to do it each time you boot one. Of course you need an internet connection to do it, though.
I agree that it is possible to install many packages while running the live image.
The caveat is that everything installed this way only resides in ram so if there is limited ram the amount of software that can reasonably be installed this way is also limited.
A second caveat is that no drivers, kernels or anything else that may require a reboot can be installed this way.
But, if the resources exist, you can do things short of a reboot, such as executing sudo systemctl restart cups to see if the live iso version of a relevant printer PPD file was the problem. It’s just not that big an investment in time or trouble not to check it out.