just for that i reinstalled twice before this.
now it works fine.
Just remember, if you do install another kernel, before
rebooting to use it, you will have to check
the On Boot
box for dkms
, again. After your reboot into that kernel, all your dkms drivers will be rebuilt during the boot process, and once you reach the desktop, you can then, once more, uncheck
the dkms On Boot