While I was trying to remove files from a SD card from the same directory, I ran sudo rm /* and now Ubuntu isn't working.
When I restarted I get the error: kernel panic attempted to kill init.
I'm new to Linux. What should I do now? I don't want to loose my data.
That command would have deleted all the links in / (and any files if you happened to have any).
Boot an install USB, mount the damaged root (change the sdxy to match your system) at /mnt:
sudo mount -t ext4 /dev/sdxy /mnt
Replace the links with the following:
cd /mnt
sudo ln -s usr/bin bin
sudo ln -s usr/sbin sbin
sudo ln -s usr/lib lib
sudo ln -s usr/lib32 lib32
sudo ln -s usr/lib64 lib64
sudo ln -s usr/libx32 libx32
The only other possible file that might cause problems eventually is a /swapfile if one were present. I don't, but that may be another thing to fix after you can boot normally.
