Hello . I installed Net Runner KDE plasma some time ago … my issue is, i have not been able to get update manager, muon or synaptic to work… the two latter are both similar; synaptic will “mark all upgrades” but then “apply” is greyed out. HELP !!!
Have you hit refresh before?
Also you can execute
sudo apt update && sudo apt upgrade
In the terminal to perform a normal update.
refresh/reload gives me the same results as prior; lists a pile of software (some of which i do not have on my system), “marks” … but nothing to aply. KONSOLE apt reports “all packages up to date” which i find impossible. Firefox is stil at 52.0. My Mint Cinammon systems have small updates almost daily.