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After upgrade M8->M9 one dir looks like this:

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d?????????  ? ?      ?                 ?                ? mnt/

It happens probably because of USB memory stick failure. The USB mem was mounted to this mnt dir.
How can I chmod/user/group or delete such directory?

Which command was used to get this output? "ls -l /" ?
E.g.:

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[test8@test8 ~]$ ls -l /
insgesamt 72
lrwxrwxrwx   1 root root     7 Jul 31  2020 bin -> usr/bin/
drwxr-xr-x   5 root root  4096 Sep  2 15:26 boot/
-rw-------   1 root root  2022 Sep  2 15:42 dead.letter
drwxr-xr-x  19 root root  3700 Sep  9 16:12 dev/
drwxr-xr-x 104 root root 12288 Sep  9 16:23 etc/
drwxr-xr-x   3 root root  4096 Jun 11 13:03 home/
drwxr-xr-x   2 root root  4096 Jul 31  2020 initrd/
lrwxrwxrwx   1 root root     7 Jul 31  2020 lib -> usr/lib/
lrwxrwxrwx   1 root root     9 Jul 31  2020 lib64 -> usr/lib64/
drwx------   2 root root 16384 Jun 11 12:48 lost+found/
drwxr-xr-x   2 root root  4096 Jul 31  2020 media/
drwxr-xr-x   2 root root  4096 Jul 31  2020 mnt/
drwxr-xr-x   3 root root  4096 Jun 11 13:17 opt/
dr-xr-xr-x 210 root root     0 Sep  9 16:12 proc/
drwxr-x---   9 root root  4096 Sep  9 16:27 root/
drwxr-xr-x  28 root root   820 Sep  9 16:12 run/
lrwxrwxrwx   1 root root     8 Jul 31  2020 sbin -> usr/sbin/
drwxr-xr-x   2 root root  4096 Jul 31  2020 srv/
dr-xr-xr-x  13 root root     0 Sep  9 16:12 sys/
drwxrwxrwt  11 root root   360 Sep  9 16:17 tmp/
drwxr-xr-x  13 root root  4096 Jun 11 12:52 usr/
drwxr-xr-x  14 root root  4096 Jun 11 13:08 var/
[test8@test8 ~]$


You shouldn't delete /mnt as this is a base directory. You should better try to change the owner via:

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# chown -R root:root /mnt

The command was ls -la.
I try to change user/group using command You mentioned. Error "Permission deny"

Did you execute this command as root user?

yes

Boot from Knoppix and fsck from gparted, resolved the problem

Good thinking
My bootable tool favourite was https://www.system-rescue.org/
But recently Mageia Live Xfce 32 bit, with persistence and added tools