在生产服务器上，我刚刚从 ubuntu 14.04 进行了 dist-upgrade 到 14.04.01。在升级过程中，我在配置 grub 时遇到了一个严重的问题。我最终追溯了问题的根源并修复了它。
现在，虽然一切配置都正确，但我还是有点急于重启服务器（远程）。在此之前，我想确保重启过程顺利进行。我想知道我应该检查什么。
以下是我之前遇到的问题的摘要以及所采用的修复方法。
在 dist-upgrade 期间：
rub-pc
Error in function:
A fatal error occurred
Please report this as a bug and include the files
/var/log/dist-upgrade/main.log and /var/log/dist-upgrade/apt.log in
your report. The upgrade has aborted.
Your original sources.list was saved in
/etc/apt/sources.list.distUpgrade.
SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
Could not install the upgrades
The upgrade has aborted. Your system could be in an unusable state. A
recovery will run now (dpkg --configure -a).
Please report this bug in a browser at
http://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+filebu...
and attach the files in /var/log/dist-upgrade/ to the bug report.
installArchives() failed
Setting up grub-pc (2.02~beta2-9ubuntu1) ...
Replacing config file /etc/default/grub with new version
Installing for i386-pc platform.
Installation finished. No error reported.
Generating grub configuration file ...
/etc/grub.d/06_OVHkernel: line 6: /usr/lib/grub/update-grub_lib: No such file or directory
dpkg: error processing package grub-pc (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
grub-pc
Upgrade complete
The upgrade has completed but there were errors during the upgrade
process.
To continue please press [ENTER]
我尝试手动配置：
# dpkg --configure -a
Setting up grub-pc (2.02~beta2-9ubuntu1) ...
Replacing config file /etc/default/grub with new version
Installing for i386-pc platform.
Installation finished. No error reported.
Generating grub configuration file ...
/etc/grub.d/06_OVHkernel: line 6: /usr/lib/grub/update-grub_lib: No such file or directory
dpkg: error processing package grub-pc (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
grub-pc
我终于找到解决方案并发布在这里：
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1362723
编辑文件 /etc/grub.d/06_OVHkernel
并用 grub-mkconfig_lib 替换 update-grub_lib。
然后再次尝试重新配置，这次成功：
# sudo dpkg --configure -a
Setting up grub-pc (2.02~beta2-9ubuntu1) ...
Replacing config file /etc/default/grub with new version
Installing for i386-pc platform.
Installation finished. No error reported.
Generating grub configuration file ...
Found linux image: /boot/bzImage-2.6.38.2-grsec-xxxx-grs-ipv6-64
No volume groups found
done
/etc/default/grub 在升级过程中发生了变化，但我不知道它如何影响 grub：
-GRUB_CMDLINE_LINUX_DEFAULT=""
+GRUB_CMDLINE_LINUX_DEFAULT="nomdmonddf nomdmonisw"
-GRUB_DISABLE_LINUX_UUID=true
+#GRUB_DISABLE_LINUX_UUID=true
我找不到该文件中的值的文档。
那么，我现在应该检查什么来确保系统已准备好成功重启？
答案1
以下问题和答案为回答我自己的问题提供了一些有用的指示：