do you see the grub screen when you reboot?
the advance options menu choice will take you to all of you other kernels you have installed and for each one there will be recovery options available.
go into the recovery option for your current kernel and at /near the bottom of the list recovery tools will be root login
use that, enter your password and you should find yourself at root level command prompt where you can run apt commands without using sudo
the command above will install the specific version of linux-firmware that you had prior to the update.
then when you reboot it should come up normally again and discover will prompt you to update the package ... DO NOT DO THIS YET.
the next thing you should do is search for timeshift and install it.
set it up to take daily snapshots of your OS so you can get back to a working machine without much fuss... just be sure to keep a thumb drive with a LIVE instance of kubuntu on it so you can use it to recover when you can't boot to the OS.
the advance options menu choice will take you to all of you other kernels you have installed and for each one there will be recovery options available.
go into the recovery option for your current kernel and at /near the bottom of the list recovery tools will be root login
use that, enter your password and you should find yourself at root level command prompt where you can run apt commands without using sudo
the command above will install the specific version of linux-firmware that you had prior to the update.
then when you reboot it should come up normally again and discover will prompt you to update the package ... DO NOT DO THIS YET.
the next thing you should do is search for timeshift and install it.
set it up to take daily snapshots of your OS so you can get back to a working machine without much fuss... just be sure to keep a thumb drive with a LIVE instance of kubuntu on it so you can use it to recover when you can't boot to the OS.







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