i've been running Kubuntu 11.04 for a couple weeks now and trying to transition away from windows but i have had this problem with seemingly random system freezing and crashing
i run kubuntu 11.04 64bit on a dell studio 1558 with a core i5, intel hd graphics, and 6gb ram
my laptop after awhile will just freeze and all i can do is a hard reset, sometimes the screen will go black with a bunch of text, but i think that only happens when virtualbox is running b/c i can sometimes get back to the desktop, but it will freeze nevertheless (i run win7 in vbox for certain things i need like itunes and office).. i do notice that my laptop is getting pretty warm, but i don't know if that's related b/c it always did under windows
i don't know if this is and issue with X, KDE, ubuntu, a driver or a kernel issue
any help would be greatly appreciated! thanks!