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
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to util-linux in Ubuntu.
https://bugs.launchpad.net/bugs/1952353
Title:
dmesg: read kernel buffer failed: Operation not permitted
Status in util-linux package in Ubuntu:
Invalid
Bug description:
Run /bin/dmesg, get:
dmesg: read kernel buffer failed: Operation not permitted
sudo dmesg works, but I should not have to do that.
ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: util-linux 2.36.1-8ubuntu2
ProcVersionSignature: Ubuntu 5.13.0-21.21-generic 5.13.18
Uname: Linux 5.13.0-21-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu71
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Thu Nov 25 11:13:58 2021
ProcEnviron:
LANGUAGE=en_US
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=
SHELL=/bin/tcsh
SourcePackage: util-linux
UpgradeStatus: Upgraded to impish on 2021-11-21 (3 days ago)
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https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1952353/+subscriptions
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