Ubuntu16.04 upgrade to 18.04 after the mouse and keyboard can not be used, only the touchpad can be used?

< H1 > can you still save me? < / H1 >
Mar.07,2021

you can press shift when starting, or choose an older kernel to start when grub. After entering the system, try the following instructions

sudo apt-get install --reinstall xserver-xorg-input-all

that is, reinstall the input system of the graphical interface.

you can also enter recovery mode via boot disk, cut to the system root directory via chroot, and then try the instructions above.

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