hi
after encountering difficulties with fresh iso of mint kde 13, i found somewhere else in the forum
that the /etc/apt/sources.list.d/ubuntu.lst and /etc/apt/sources.list.d/medibuntu.lst had to be rewritten,
replacing the word "maya" by "precise" in all occurences (NOT IN mint.lst)
after doing an update system update & fixes works normally
hope this helps newcommers until a correction will be made to the iso
apog

