GRUB / GRUB2

Things

Argument to fix some graphical issues in Proxmox install:
nomodeset

Reset Root Password

1. enter GRUB2 edit mode
2. modify linux-kernel string by adding rd.break at the end
3. press CTRL+x to boot with entered options
4. use chroot to mount /sysroot to / chroot /sysroot, pwd should read /
5. remount the root file system in read/write mode mount -o remount,rw /
6. run passwd to set new password passwd
7. create hidden file .autorelabel to run SELinux relabeling on all files touch .autorelabel
8. exit the chroot shell and reboot