Issue Description
During command execution or system startup, an error message that the command or lib was not found is reported.
Common Causes
The bin, sbin, lib, and lib64 of CentOS 7, CentOS 8, and Ubuntu 20 are soft links as follows:
lrwxrwxrwx 1 root root 7 Jun 19 2018 bin -> usr/bin
lrwxrwxrwx 1 root root 7 Jun 19 2018 lib -> usr/lib
lrwxrwxrwx 1 root root 9 Jun 19 2018 lib64 -> usr/lib64
lrwxrwxrwx 1 root root 8 Jun 19 2018 sbin -> usr/sbin
If a soft link is deleted, an error will be reported during command execution or system startup.
Solution
Check and create the required soft links as instructed in Steps. Steps
1. Enter the rescue mode.
2. Run commands such as mount and chroot. When running the chroot command:
If there is an error, run cd /mnt/vm1.
Otherwise, run cd /.
3. Run the following command to check whether the corresponding soft link exists.
ls -al / | grep -E "lib|bin"
If no, run the following commands as needed to create corresponding soft links.
ln -s usr/lib64 lib64
ln -s usr/sbin sbin
ln -s usr/bin bin
ln -s usr/lib lib
4. Run the following command to check the soft links.
chroot /mnt/vm1 /bin/bash
If no error is reported, the soft links have been successfully repaired.
5. Exit rescue mode and start the system.