Public bug reported:
After disabling IPv6 via sysctl.conf (by setting
net.ipv6.conf.all.disable_ipv6 = 1 and
net.ipv6.conf.default.disable_ipv6 = 1) on Ubuntu 24.04 LTS, WiFi
connectivity becomes unstable. NetworkManager repeatedly fails to assign
IPv6 addresses and throws multiple “Permission denied” errors related to
do-add-ip6-address. Even after removing those lines and rebooting, the
issue persists intermittently — WiFi shows a question mark icon, and the
connection randomly drops until I manually open the network menu.
This issue occurs on a laptop with an ath10k wireless driver.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: network-manager 1.46.0-1ubuntu2.2
ProcVersionSignature: hostname 6.11.0-29.29~24.04.1-generic 6.11.11
Uname: Linux 6.11.0-29-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Jul 22 04:03:10 2025
InstallationDate: Installed on 2024-08-23 (332 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
IpRoute:
default via 192.168.1.1 dev wlp2s0 proto dhcp src 192.168.1.64 metric 600
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown
192.168.1.0/24 dev wlp2s0 proto kernel scope link src 192.168.1.64 metric 600
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/usr/bin/zsh
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.NetworkManager.conf.d.default-wifi-powersave-on.conf:
[connection]
wifi.powersave = 2
mtime.conffile..etc.NetworkManager.conf.d.default-wifi-powersave-on.conf:
2025-07-22T03:22:27.020795
nmcli-nm:
RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI
WWAN-HW WWAN
running 1.46.0 connected started full enabled enabled
enabled missing disabled
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
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https://bugs.launchpad.net/bugs/2117448
Title:
WiFi fails to connect after disabling IPv6 in sysctl.conf on Ubuntu
24.04
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