前几天开机，通知说说系统马上不支持了。于是我想，要不干脆还是升个级吧。尽管升了级可能没有啥实质性的性能提升。但最更新以后总觉得跟上了时代啊。
我的fedora系统是这样（uname -a）
Linux fedora 6.14.5-100.fc40.x86_64 #1 SMP PREEMPT_DYNAMIC Fri May 2 14:22:13 UTC 2025 x86_64 GNU/Linux
然后先更新
sudo dnf upgrade --refresh
最新版好像是44，要不就直接升级吧。AI说就这么干，
sudo dnf system-upgrade download --releasever=44 --allowerasing
结果最后出问题了，运行
sudo dnf system-upgrade reboot
显示
error: system is not ready for upgrade
我问AI可能是什么原因。它说，官方说一下子升级4个版本不支持，建议两级两级的升。我xxx，此处省略x个字。之前那个命令我下载了4127个文件，运行了5个小时。你现在告诉我不能这样。你当初是拿我开涮是吗？
然后删掉中间残留
sudo dnf system-upgrade clean
sudo dnf clean all
重新来
sudo dnf system-upgrade download --releasever=42 --allowerasing
又是5个小时的样子，然后还是
error: system is not ready for upgrade
一定有鬼。我重跑
sudo dnf upgrade --refresh
发现
Last metadata expiration check: 0:24:15 ago on Thu 10 Sep 2026 10:51:49 AM CST.
Package dnf-plugins-core-4.10.1-1.fc40.noarch is already installed.
Dependencies resolved.
Nothing to do.
Complete!
Fedora 40 - x86_64 291 B/s | 4.0 kB 00:14
Fedora 40 openh264 (From Cisco) - x86_64 1.1 kB/s | 989 B 00:00
Fedora 40 - x86_64 - Updates 2.5 kB/s | 4.0 kB 00:01
google-chrome 6.8 kB/s | 1.3 kB 00:00
Dependencies resolved.
=================================================================================================================================================================================================================
Package Architecture Version Repository Size
=================================================================================================================================================================================================================
Upgrading:
google-chrome-stable x86_64 153.0.8010.36-1 google-chrome 138 M
Transaction Summary
=================================================================================================================================================================================================================
Upgrade 1 Package
Total size: 138 M
Is this ok [y/N]: y
Downloading Packages:
[SKIPPED] google-chrome-stable-153.0.8010.36-1.x86_64.rpm: Already downloaded
google-chrome 78 kB/s | 19 kB 00:00
GPG key at https://dl.google.com/linux/linux_signing_key.pub (0xD38B4796) is already installed
The GPG keys listed for the "google-chrome" repository are already installed but they are not correct for this package.
Check that the correct key URLs are configured for this repository.. Failing package is: google-chrome-stable-153.0.8010.36-1.x86_64
GPG Keys are configured as: https://dl.google.com/linux/linux_signing_key.pub
Try to add '--enableplugin=expired-pgp-keys' to resolve the problem. Note: This plugin might not be installed by default, as it is part of the 'dnf-plugins-core' package.
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'dnf clean packages'.
Error: GPG check FAILED
原来Google密钥已过期。然后
sudo dnf system-upgrade download --releasever=42 --allowerasing --enableplugin=expired-pgp-keys
然后接下来又是4-5个小时。然后，
sudo dnf system-upgrade reboot
系统就升级为42了。
接下来继续
sudo dnf system-upgrade download --releasever=44 --allowerasing
又是4-5个小时。最后
sudo dnf system-upgrade reboot
终于升级到了44。最后别忘了来一个，
sudo dnf upgrade
现在是
Linux fedora 7.2.4-200.fc44.x86_64 #1 SMP PREEMPT_DYNAMIC Mon Sep 7 19:10:19 UTC 2026 x86_64 GNU/Linux
还好这台电脑目前没有急活，要不然真的急。整了快一周才更新成功。 看样子AI还不能轻信啊，可能多问几个AI比较稳。
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