Changing qubes default global kernel / adding kernel 's

since with latest kernel in 4.2 there’s some issue, my laptop is slow with it, how can i change kernel without bricking system? possible to do through ui?, i have the system installed already

You can change the default kernel for qubes in Qubes Global Config tool.
To change the kernel used by dom0 you need to boot the Qubes OS using GRUB entry with specific kernel version that you want to use.

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