Reinstall drivers on Kubuntu in recovery mode

Ubuntu keyboard and mouse drives fail after upgrade:

sudo apt-get install -y xserver-xorg-input-all // reboot => also may solve other problems

sudo apt install nvidia-settings

If no internet connection in recovery mode or on Plasma Desktop

nmcli dev status

ping 8.8.8.8

sudo dhclient

Troubles with smartphone detection and other USB issues:

sudo apt reinstall mtp-tools

sudo apt reinstall libmtp*

sudo apt reinstall usb*

Network manager problems:

sudo apt install plasma-nm

sudo apt install network-manager

Show current Linux kernel name:

ls /boot

uname -r

uname -r -s -m -p -i -o

Linux 5.15.0-46-generic x86_64 x86_64 x86_64 GNU/Linux 

Reinstall Linux kernel:

sudo apt-get install --reinstall linux-image-$(uname -r)

Remove unused Linux kernel:

dpkg --list | grep linux-image // display a list of installed Linux kernel packages

sudo apt remove linux-image-5.4.0-90-generic // remove unused kernel

sudo apt remove linux-headers-VERSION*

sudo apt remove linux-modules-VERSION*

sudo apt remove linux-extra-VERSION*

Show info about system devices:

lscpu

lsblk

lsusb

lspci

sudo lshw