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this is the 2nd time I have come across this error, and I am trying to understand why it occurred. Has my device been compromised, as suggested here?

I am running Ubuntu 22.04

Steps taken leading up to error:

sudo chmod 600 configfile.yaml (From inside /etc/netplan/) sudo configfile.yaml (commented out irrelevant line, ctrl-x, yes, saved file)

When I attempted to apply my changes...

(base) user@device:/etc/netplan$ sudo netplan apply -bash: /usr/bin/sudo: no such file or directory (base) user@device: cd /usr/bin (base) user@device: ls -bash: /usr/bin/ls: no such file or directory

Suddenly, almost every command failed to run. Though /usr/bin still existed, many commands were missing.

My path variable seemed fine...

echo $PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

But I could not do anything. I tried rebooting, it failed to find an init file in any folders, loading to 'initramfs'

run-init: cant execute '/sbin/init': No such file or directory

I do not know what the issue was, but many files in 'root/sbin, root/bin, root/lib' were entirely missing.

Copying these folders from a clean install resolved the problem, allowing me to boot again, but I am trying to understand why the issue occurred, how I can prevent it from occurring again, and if my device has been rooted as a result of some open ports.

If it is helpful...

The first time this occurred, I tried to run this file sudo sh ./script.sh.

grep /etc/netplan/configfile.yaml >> output.txt grep /etc/hostapd/configfile.conf ip a show wlan0 >> output.txt echo "Text..." >> output.txt systemctl enable netplan >> output.txt

Issues with the script, Sure. Nothing in here seems like it should have bricked my machine though.

UPDATE:

It happened again. No idea why. I tried to ssh in and it wouldn’t accept my key. Wanted me to manually login. Typed it out but it kept saying ‘invalid password’.

After I copied over the missing folders from the 2nd time, I tried the following

  • [x] Read tested all Disk chunks
  • [x] fsck’d boot drive (mmcblk0p1). Can’t figure out how to fsck root drive. It’s mounted in initramfs, if i umount it, the folder /dev disappears, and I can’t fsck if.
  • [x] Tried reinstalling/repairing ubuntu core libraries
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  • Read the documentation on how grep works. It looks for a "pattern" in /something/, but that something, by default, is stdin, which would cause the "hang" that you describe - just grep waiting for input! You have only provided the pattern (which /looks like/ a file path), not the input. Commented Oct 14, 2024 at 7:16
  • Hmm, do you believe exiting the program when it hung could have caused this issue? That makes sense, but I have no idea why this would delete my /bin files Commented Oct 17, 2024 at 3:54

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(base) user@device: cd /usr/bin (base) user@device: ls -bash: /usr/bin/ls: no such file or directory

Asuming that this occurred while the machine was running off its usual disk, then this is the issue - not just sudo.

Either something is masking /usr/bin, the files have been deleted or the filesystem has gone away.

I tried rebooting, it failed to find an init file in any folders

Most likely options 2 or 3 then. Reboot from removable media, check the disk and filesystems for errors.

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  • Yes, the issue is with many commands. Reboot, shutdown, sudo, ls, fdisk... were all missing. Machine is running of its usual disk, built-in orange pi emmc chip. In initramfs I checked my boot / root partitions, but fsck found no errors. Any other suggestions to check? I can restore /bin from a copy, but I would really like to know why this is occurring so I can prevent it in the future. Is it possible the issue occured because I forced a restart by holding the power button, since 'reboot' didn't work? Its unlikely the device was rooted right? Commented Oct 17, 2024 at 4:06
  • I added an update, any ideas? Commented Oct 25, 2024 at 16:17

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