How do I get past BusyBox?

Question

I have a problem with my Ubuntu installation. When I go to start Ubuntu from UEFI, I get the purple screen and choose Ubuntu (as normal), but then I am greeted with BusyBox and it won't let me get to Ubuntu for some reason.

BusyBox Output:

BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
Enter 'help' for a list of commands.

(initramfs) [    7.474227] sd 2:0:0:0: [sdb] No Caching mode page found
[   7.474295] sd 2:0:0:0: [sdb] Assuming drive cache: write through

I am running Ubuntu from a flashdrive, and I am running the flash drive not directly from a computer port anymore, but from a USB extender because the USB ports messed up (I don't know how), and only one USB port it working. I checked in Windows if the flash drive is detected from the extender, and it is. Also in BusyBox, I don't have the fdisk command in /sbin, and I don't have a /mnt folder.

How should I fix this?

Solution

From the comments...

re: I get the purple screen and choose Ubuntu (as normal), but then I am greeted with BusyBox and it won't let me get to Ubuntu for some reason.

At the busybox prompt, type fsck -f / (you may have to type exit and then fsck -f /) to fix any file system corruption.

Comments

[Boris Hamanov]

"I am running Ubuntu from a flashdrive" is problem #1. At the busybox prompt, type fsck -f / (you may have to type exit and then fsck -f /). Report back.

[Meninx - メネンックス]

BusyBox can occur when trying to use a persistent partition with a syslinux boot, such as UNetbootin makes, try a grub2 booter like mkusb makes.

[christophrrb]

@heynnema the computer works fine now. Thank you.

[Boris Hamanov]

@user189452 glad it's working for you! I'll put that into a quick answer, and maybe you can accept it for me? Thanks!

[hoatzin]

FSCK also worked for me, thanks! I was running Kubuntu 20.04 from the hard disk. I attempted to run FSCK at the prompt but failed. After reading up on FSCK at linuxhandbook.com/fsck-command I ended up booting to a live USB and running "sudo fsck /dev/sda3" from a terminal window.