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root@cd:~# sudo find / -iname 'mysql*' -exec rm -rf {} \;
find: ‘/run/user/1000/gvfs’: Permission denied
rm: cannot remove '/snap/core/8039/etc/apparmor.d/abstractions/mysql': Read-only file system
rm: cannot remove '/snap/core/8039/usr/share/bash-completion/completions/mysql': Read-only file system
rm: cannot remove '/snap/core/8039/usr/share/bash-completion/completions/mysqladmin': Read-only file system
rm: cannot remove '/snap/core/7917/etc/apparmor.d/abstractions/mysql': Read-only file system
rm: cannot remove '/snap/core/7917/usr/share/bash-completion/completions/mysql': Read-only file system
rm: cannot remove '/snap/core/7917/usr/share/bash-completion/completions/mysqladmin': Read-only file system
rm: cannot remove '/snap/core18/1265/etc/apparmor.d/abstractions/mysql': Read-only file system
rm: cannot remove '/snap/core18/1223/etc/apparmor.d/abstractions/mysql': Read-only file system
steeldriver
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Naveen kumar
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    I don't actually see a question in your post (heading aren't always visible when page is opened; so heading info should be repeated). A RO (read-only) file system usually means an error occurred which needs to be investigated; it's made read-only to prevent data loss with messages thrown to logs giving clues as to why. You need to scan logs, possibly reboot & `fsck` your file-system - ie. normal system maintenance. – guiverc Dec 04 '19 at 13:05
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    Related: [Why can snap files not be modified in any way?](https://askubuntu.com/questions/919091/why-can-snap-files-not-be-modified-in-any-way) – steeldriver Dec 04 '19 at 13:09

2 Answers2

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This is a snap based on its location. Snaps are sandboxed and the proper way to remove them is to do a sudo snap remove mysql

stratus
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snaps are all mounted read-only.

Check this command:

mtodorov@efk:~$ mount | grep snaps
/var/lib/snapd/snaps/hello_20.snap on /snap/hello/20 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/canonical-livepatch_88.snap on /snap/canonical-livepatch/88 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/hello_38.snap on /snap/hello/38 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/core_8039.snap on /snap/core/8039 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/canonical-livepatch_90.snap on /snap/canonical-livepatch/90 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/core_7917.snap on /snap/core/7917 type squashfs (ro,nodev,relatime,x-gdu.hide)
mtodorov@efk:~$

As you see, all snaps have first option ro among (ro,nodev,relatime,x-gdu.hide) mount options, which is a shorthand for "read-only".

Hope this helps.

gmt42
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