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在 Ubuntu 20.04 中收到消息“需要重新启动系统。内核 SRU 周期已结束”

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在 Ubuntu 20.04 中收到消息“需要重新启动系统。内核 SRU 周期已结束”

在我家网络上的无头服务器上运行 Ubuntu 20.04.6。昨天，我收到此错误：

*** 需要重启系统。内核 SRU 周期已结束 ***

已经（当然）重新启动了，但仍然收到相同的消息。

lasse@leia:~$ sudo apt update
Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease
Get:2 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Hit:3 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-security InRelease
Get:5 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [3,233 kB]
Get:6 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [1,180 kB]
Fetched 4,526 kB in 2s (2,491 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.

lasse@leia:~$ sudo apt full-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
Get more security updates through Ubuntu Pro with 'esm-apps' enabled:
  lynx-common lynx libgsasl7
Learn more about Ubuntu Pro at https://ubuntu.com/pro
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

lasse@leia:~$ uname -a
Linux leia 5.4.0-146-generic #163-Ubuntu SMP Fri Mar 17 18:26:02 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
lasse@leia:~$ canonical-livepatch status
last check: 18 minutes ago
kernel: 5.4.0-146.163-generic
server check-in: succeeded
kernel state: ✗ Livepatch coverage ended 2024-04-17; please upgrade the kernel and reboot
patch state: ✓ all applicable livepatch modules inserted
patch version: 102.1

lasse@leia:~$ awk -F\' '/menuentry / {print $2}' /boot/grub/grub.cfg
Ubuntu
Ubuntu, with Linux 5.4.0-146-generic
Ubuntu, with Linux 5.4.0-146-generic (recovery mode)
Ubuntu, with Linux 5.4.0-137-generic
Ubuntu, with Linux 5.4.0-137-generic (recovery mode)

有什么指点吗？

编辑：

lasse@leia:~$ apt-cache policy linux-image-generic
linux-image-generic:
  Installed: (none)
  Candidate: 5.4.0.176.174
  Version table:
     5.4.0.176.174 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu focal-security/main amd64 Packages
     5.4.0.26.32 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

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