Ubuntu 22.04.3 LTS下NetworkManager IPv6地址添加失败及cron权限警告导致WiFi不稳定问题求助

大家好，我最近在用Dell XPS 13（Ubuntu 22.04.3 LTS系统）时碰到了WiFi不稳定的问题：连接新网络时经常出状况，有时候甚至得重启笔记本才能恢复正常。为了找原因，我去查看了系统日志，发现了NetworkManager的报错和cron的权限警告，想问问有没有朋友知道这是怎么回事？

我是通过以下命令查看日志的：

cd /var/log
tail -f syslog

得到的关键日志内容如下：

Jan 17 19:45:55 xbass-XPS-13-9310 NetworkManager[809]: <warn>
[1705495555.2180] platform-linux: do-add-ip6-address[7:
fe80::df6d:7462:225:5854]: failure 13 (Permission denied)

Jan 17 19:45:56 xbass-XPS-13-9310 NetworkManager[809]: <warn>
[1705495556.2517] platform-linux: do-add-ip6-address[2:
fe80::7861:57e3:a37f:b69e]: failure 13 (Permission denied)

Jan 17 19:45:57 xbass-XPS-13-9310 NetworkManager[809]: <warn>  [1705495557.2194] platform-linux: do-add-ip6-address[7: fe80::9bb2:1e03:9349:cd61]: failure 13 (Permission denied)

Jan 17 19:45:58 xbass-XPS-13-9310 NetworkManager[809]: <warn>  [1705495558.2529] platform-linux: do-add-ip6-address[2: fe80::f33:e3be:9997:148a]: failure 13 (Permission denied)

Jan 17 19:45:59 xbass-XPS-13-9310 NetworkManager[809]: <warn>  [1705495559.2203] platform-linux: do-add-ip6-address[7: fe80::5785:9f45:a953:9d57]: failure 13 (Permission denied)

Jan 17 19:46:00 xbass-XPS-13-9310 NetworkManager[809]: <warn>  [1705495560.2534] ipv6ll[3325977be1a6d754,ifindex=2]: changed: no IPv6 link local address to retry after Duplicate Address Detection failures (back off)

Jan 17 19:46:01 xbass-XPS-13-9310 NetworkManager[809]: <warn>  [1705495561.2217] platform-linux: do-add-ip6-address[7: fe80::60dc:4589:16e8:3061]: failure 13 (Permission denied)

Jan 17 19:46:01 xbass-XPS-13-9310 cron[845]: (*system*) INSECURE MODE (group/other writable) (/etc/crontab)

Jan 17 19:46:01 xbass-XPS-13-9310 cron[845]: (*system*e2scrub_all) INSECURE MODE (group/other writable) (/etc/cron.d/e2scrub_all)

Jan 17 19:46:01 xbass-XPS-13-9310 cron[845]: (*system*anacron) INSECURE MODE (group/other writable) (/etc/cron.d/anacron)

我猜测这些NetworkManager反复出现的**IPv6地址添加失败（权限拒绝）**警告，可能就是WiFi不稳定的根源？另外cron的这些权限警告，会不会和这个问题有关联？

希望有经验的朋友能帮忙分析下原因，或者给我一些排查、解决的具体建议，非常感谢！

备注：内容来源于stack exchange，提问作者xbass540