Linux, Ubuntu Read-Only filesystem 에러 해결하기

1. filesystem 확인

& cat /proc/mounts | grep /dev

udev /dev devtmpfs rw,nosuid,noexec,relatime,size=1995760k,nr_inodes=498940,mode=755 0 0 devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 /dev/vda1 / ext4 ro,relatime 0 0 cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0 mqueue /dev/mqueue mqueue rw,nosuid,nodev,noexec,relatime 0 0 /dev/vda15 /boot/efi vfat rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 0 /dev/loop0 /snap/core20/1879 squashfs ro,nodev,relatime 0 0 /dev/loop1 /snap/lxd/24061 squashfs ro,nodev,relatime 0 0 /dev/loop2 /snap/snapd/19122 squashfs ro,nodev,relatime 0 0 /dev/loop3 /snap/core20/1891 squashfs ro,nodev,relatime 0 0 /dev/loop4 /snap/snapd/19361 squashfs ro,nodev,relatime 0 0

ro 라고 되어있는 것 이확인되면,

 

아래와 같이 mount를 해제하고 복구(e2fsck)

$ sudo umount /dev/loop0
$ sudo e2fsck /dev/loop0

e2fsck 1.45.5 (07-Jan-2020)
/dev/loop0 is in use.
e2fsck: Cannot continue, aborting.


$ sudo umount /dev/loop1
$ sudo e2fsck /dev/loop1

e2fsck 1.45.5 (07-Jan-2020)
e2fsck: Operation not permitted while trying to open /dev/loop1
You must have r/w access to the filesystem or be root


$ sudo umount /dev/loop2
$ sudo e2fsck /dev/loop2

e2fsck 1.45.5 (07-Jan-2020)
/dev/loop2 is in use.
e2fsck: Cannot continue, aborting.


$ sudo umount /dev/loop3
$ sudo e2fsck /dev/loop3

e2fsck 1.45.5 (07-Jan-2020)
e2fsck: Operation not permitted while trying to open /dev/loop3
You must have r/w access to the filesystem or be root


$ sudo umount /dev/loop4
$ sudo e2fsck /dev/loop4

e2fsck 1.45.5 (07-Jan-2020)
e2fsck: Operation not permitted while trying to open /dev/loop4
You must have r/w access to the filesystem or be root


$ sudo umount /dev/vda1
$ sudo e2fsck /dev/vda1

e2fsck 1.45.5 (07-Jan-2020)
cloudimg-rootfs: clean, 90465/5160960 files, 973767/10457339 blocks

 

완료되면 재부팅 후 정상적으로 사용!