GRUB

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wikipedia:Grub

• update-grub

AppArmor

GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT apparmor=0"

virsh console
 GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0"
 GRUB_TERMINAL="serial console"
Ref: https://serverfault.com/a/705062

• Recovery mode: press and hold the Shift key (or Escape key)
• MacOS Command + R

Related terms

• Das U-Boot
• runlevel: single

See also

• GRUB, update-grub, Das U-Boot, runlevel
• Linux Kernel: namespaces, Cgroups, OOM, proc, Linux Kernel changelog, sysctl, userfaultfd, Grub, ENOSPC, ENOMEM, DKMS, syscall, Transparent huge pages, smatch, sysfs, vm.swappiness, CFS, Runlevel, Jens Axboe, Consistent Network Device Naming, Initial ramdisk (initrd), modprobe, MTD, Linux Kernel vulnerabilities, /sys/kernel/, KernelCare, unix://, Data Plane Development Kit (DPDK)