as I am a new user of Linux or rather Linux Lubuntu I have a initially some application isuues. Just wanted to participate my mainboard to get some free space on the mainboad and have not a clue which steps I have to do to participate the mainboard. I tried it over the option changig the seize of the mainboard but receive then always the error report Error unmountig/dev/sda1: target is busy (udisks-error-quark, 14). After that I added the software gparted but also here the option changig the seize of the mainboard did not reach me to the goal participating the mainboard.
Which steps do I have to take precisely to participate my mainboard? Thanks in advance and many regards