Linux Ubuntu fails to boot - Problem loading UEFI:db X.509 certificate

Issue

Lenovo Ideapad laptop running Ubuntu fails to boot with the following error:

[1.858988] Problem loading UEFI:db X.509 certificate (-65)
BusyBox v1.27.2 (Ubuntu 1:1.27.2-2ubuntu3.3) built-in shell (ash)
Enter 'help' for a list of built-in commands.
(initramfs)

FreeDOS IntiDisk - Invalid Opcode

Issue

UBCD, Spinrite and other tools utilizing FreeDOS fail to boot on Dell OptiPlex 980 PC with the following error message:

IntiDisk
Invalid Opcode at 03A0 0000 0F03 0D44 7C44 0B63 6218 8F15 6C6D 0D44 001E 0000 0000

Recover data from faulty Synology NAS

Issue

Synology DiskStation 415+ NAS failed. Blue power button LED keeps blinking. Status LED is off. All 4 disk orange LEDs steady on (there are only 2 HDDs installed). Removing all hard drives doesn't change anything. Replacing RAM doesn't change anything either. All this indicated motherboard failure. Owner asked to recover data from hard drives.

RetroPie - enable SSH root access

To access RetroPie via SSH using root account:

• Open file sshd_config located in etc/ssh:
  sudo nano /etc/ssh/sshd_config 
  • Find line:
    PermitRootLogin without-password
  • Comment it out (or delete) it and replace with:
    PermitRootLogin yes
  • Save changes (CTRL + X)
• Set root password:
  sudo passwd root
• Reboot your Raspberry Pi