I have Ubuntu 20.04 on my PC. I turned it off after use. I tried to start it and I got this black screen instead of the usual sign-in startup page.
BusyBox v1.30.1 (Ubuntu 1:1.30.1-4ubuntu6.5) built-in shell (ash)
Enter 'help' for a list of built-in commands.
(initramfs) help
Built-in commands:
. : [ alias break cd chdir command continue echo eval exec exit
export false getopts hash help history let local printf pwd read
readonly return set shift test times trap true type ulimit umask
unalias unset wait [ [[ acpid arch ash awk basename blockdev
busybox cat chmod chroot chvt clear cmp cp cut date deallocvt
deluser devmem df du dumpkmap echo egrep env expr false fbset
fgrep find fold fstrim grep gunzip gzip hostname hwclock ifconfig
ip kill ln loadfont loadkmap ls lzop mkdir mkfifo mknod mkswap
mktemp modinfo more mount mv nuke openvt pidof printf ps pwd
readlink reboot reset rm rmdir run-init sed seq setkeycodes sh
sleep sort stat static-sh stty switch_root sync tail tee test
touch tr true tty umount uname uniq wc wget which yes
(initramfs)
