After signing and upgrading my kernel to 5.15 on Ubuntu Server 20.04, everything boots fine. It drops me into a shell login and after a few moments I'm flooded with this error.
bpfilter: read error 0
Any ideas?
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How exactly did you update the kernel? – Nmath Nov 05 '21 at 02:01
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Downloaded from the ppa mainline. Then sudo dpkg -i *.deb – Matt Settlemeyer Nov 05 '21 at 02:03
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The mainline kernel is not considered stable and should only be used for testing purposes. I suggest that you revert the changes that you made. See: Ubuntu Wiki Mainline Builds. If you wish to continue testing an unsupported kernel, please file a bug report so that developers can identify and fix these issues. – Nmath Nov 05 '21 at 02:34
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Ok, thanks for the links. – Matt Settlemeyer Nov 05 '21 at 02:50
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Yes, some are having troubles with bpfilter issues. Myself, I have not been able to re-create the issue. – Doug Smythies Nov 05 '21 at 04:40
1 Answers
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I have found a workaround to fix this issue. If you disable bpfilter and ufw (Ubuntu firewall) as follows, the dmesg command does not display the error messages (e.g. bpfilter: read error 0).
Edit
/etc/modprobe.d/blacklist.conf:sudo vi /etc/modprobe.d/blacklist.confAdd:
blacklist bpfilterSave and close
viby pressing::wqand Enter.Then run the following commands:
sudo ufw status sudo ufw disable sudo ufw status
Some system info:
$ uname -a
Linux 5.15.2-051502-generic #202111121041 SMP Fri Nov 12 16:26:56 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.3 LTS"
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