DNF update failed "[Errno 30] Read-only file system"

edit

That what was I'm trying to do. Mounting my / from live USB as rw and fix the problem but even it is mounted as rw it keeps on returning Read-only file system:.

$ ls -l
drwxr-xr-x   19 root root  4140 Nov 15 11:50 dev
drwxr-xr-x. 149 root root 12288 Nov 15 11:49 etc
drwxr-xr-x.  24 root root  4096 Nov  8 22:52 var

Another update I found this from dmesg:

Aborting journal on device sda3-8.
EXT4-fs error (device sda3): ext4_journal_check_start:61: Detected aborted journal
EXT4-fs (sda3): Remounting filesystem read-only

I think this why it keep on ro

OK, it's not a permissions as such, which is exactly what I was afraid of. You may have to unmount the partition and run fsck to clean everything up, unless some other reader has a better idea.

Thanks for the response!

running e2fsck from live USB

$ sudo e2fsck /dev/sda3
e2fsck 1.44.3 (10-July-2018)
/dev/sda3: clean, 277759/6553600 files, 4777569/26214400 blocks

Hm, a tricky one. Let's start with rebuilding the database. As root do:

cd /var/lib/
rm __db*
rpm --rebuilddb

Here you go:

[/var/lib]$ rm __db*
rm: cannot remove '__db*': No such file or directory
[/var/lib]$ rpm --rebuilddb 
error: can't create transaction lock on /var/lib/rpm/.rpm.lock (Permission denied)
[/var/lib]$ sudo rpm --rebuilddb
[/var/lib]$

After doing this I don't see any __db* files on my /var/lib

Sorry, I dropped the rpm. The correct path is /var/lib/rpm/ . Before erasing and recreating check whether __db.001, .002, .003 are present.