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Linux: Booting in single-user mode

28th March 202228th March 2022 DavidLinux, TroubleshootingLeave a Comment on Linux: Booting in single-user mode

Sometimes it might be necessary to start in single-user mode to do some administration work, or even reset an existing password. Normally this can be achieved via the GRUB boot loader. CentOS / RedHat (with root account enabled) Switch on your system. Press Esc until the GRUB menu shows up.…

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Ubuntu/GRUB: Error: invalid environment block

13th August 2020 DavidLinux, UbuntuLeave a Comment on Ubuntu/GRUB: Error: invalid environment block

After a recent system update I got the following error message: Luckily the system would boot up but ignoring errors isn’t best practice. This error is caused by a faulty GRUB2 environment block. This is a file located in /boot/grub/grubenv. You can easily regenerate it with the following commands. It…

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Ubuntu: Fixing the “error: no video mode activated” message on boot

15th August 201915th August 2019 DavidUbuntuLeave a Comment on Ubuntu: Fixing the “error: no video mode activated” message on boot

During boot of your system and just after the BIOS messages Ubuntu might display a black screen with an error: no video mode activated message. The system boots normally but it is annoying. GRUB by default hides the boot menu and this message can show up if there is no…

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  • Ubuntu: apt error message “Key is stored in legacy trusted.gpg keyring”
  • Linux: Booting in single-user mode
  • ZFS ‘Failed to start Mark current ZSYS boot as successful’ fix

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