ok, but i dont delete it the original kernel. i can be select from grub menu, just not work. thats why i can't boot in and restore the generic kernel.
so, the ubuntu is under linuxmce is different something with standard ubuntu? if not, i think this proble is problem of ubuntu/grub not linuxmce.
other: the install dvd make full feature working mythtv config on my htpc, on other disitrib this need at least one week hard work. and the linuxmce is working at first reboot, i wondering not a litle