I have successfully upgraded to 12.04 but now receive warning messages that the root is running out of space, having left only some 270MB. I am surprised about that message becasue I have allocated almost 12GB to root. Further, the Disk Usage Analyzer (see screenshot) indeed says that 100% of / are used whereas GParted (see other screenshot) says that there are >3GB unused space (of a total of >11GB). The Disk Usage Analyzer also says that 91% of my /home are used whereas GParted shows 105GB unused space (of a total of 180GB).
What do I miss? Does anybody have a similar problem? Can anybody help?