Read only file system

readonly file system error need manual fsck

reboot VM in recovery mode.

check the partition name using fdisk -l command

check the main partition which is most of the time is first partition with name Disk /dev/xvda1 .

Check the size to verify and confirm it is the correct one.

run fsck on it using e2fsck -fy -C0 /dev/xvda1

now logout from ssh/console session and reboot vm (not recovery mode).