I inadvertently failed to append myself to a group by using
usermod -G group_name user_name instead of
usermod -aG group_name user_name and now belong only to the
The problem is: I can not bring up the grub2 menu with Left-Shift on boot, therefore I can not drop to root login and reinstate my
Is there another way?
To be clear, I have not lost my password, I have inadvertently removed myself from the admin group.