When you have this error, it means that your system has by default, a line in /etc/fstab which indicates that if there is an error in the file system, that it should go into read-only mode, to prevent further corruption or dataloss.
You could use lsblk to determine the partition name.
Use the command
sudo fsck -f /dev/sdxx
Also, Take a Look at this if problem persists.
You Previously Created a post for booting Error, It might be Because of file corruption. You might want to reinstall the System if there is no important data present.
Use This Guide,