How to fix fstab file issue, if entry/entries added wrongly (Virtual Machine)

In order to simulate the problem i have added wrong entry to /etc/fstab file. 

Steps 1: Added entry /dev/sdb2 instead of /dev/sdb1. Let’s reboot the machine see what will happen.


Step 2: Machine is unable to boot as /dev/sdb2 is not found at the place. Now type root user password and get login  for maintenance.  So ultimately we have make correct entry to /etc/fstab file. 


Step 3: Here I am trying editing the /etc/fstab file. But it won’t allow to edit as file does not have write permission. To change the permission use command “mount -w -o remount /”. And edit /etc/fstab file with correct entry and reboot the machine. So that all need to do to correct problem.



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