I can confirm dmesg on Ubuntu 21.10 gives me "Operation not permitted", even though my user is in the "adm" group:
$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 21.10 Release: 21.10 Codename: impish $ ls -l /var/log/dmesg* -rw-r----- 1 root adm 100336 Mar 13 17:01 /var/log/dmesg -rw-r----- 1 root adm 94365 Mar 13 16:40 /var/log/dmesg.0 -rw-r----- 1 root adm 23990 Mar 13 15:00 /var/log/dmesg.1.gz -rw-r----- 1 root adm 23017 Mar 9 21:50 /var/log/dmesg.2.gz -rw-r----- 1 root adm 23295 Mar 4 18:51 /var/log/dmesg.3.gz -rw-r----- 1 root adm 23253 Feb 24 21:34 /var/log/dmesg.4.gz $ id uid=1000(marji) gid=1000(marji) groups=1000(marji),4(adm),5(tty),10(uucp),20(dialout),24(cdrom),27(sudo),30(dip),46(plugdev),121(lpadmin),132(lxd),133(sambashare),134(docker) $ dmesg dmesg: read kernel buffer failed: Operation not permitted -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1952353 Title: dmesg: read kernel buffer failed: Operation not permitted To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1952353/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
