我需要释放/boot分区中的一些空间。
在另一个[线程][1]中查看，我发现我应该用它sudo dpkg --list 'linux-image*'来定位并sudo apt-get remove linux-image-VERSION删除未使用的内核映像，但是无论我选择哪一个，它们都说最后一个 51 取决于它；它提供了强制执行的选项，但我不能 100％ 确定那是正确的方法。
$ uname -r
3.13.0-49-generic
$ sudo dpkg --list 'linux-image*'
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-========================-=================-=================-=====================================================
un linux-image <none> <none> (no description available)
un linux-image-3.0 <none> <none> (no description available)
ii linux-image-3.13.0-32-ge 3.13.0-32.57 i386 Linux kernel image for version 3.13.0 on 32 bit x86 S
ii linux-image-3.13.0-40-ge 3.13.0-40.69 i386 Linux kernel image for version 3.13.0 on 32 bit x86 S
ii linux-image-3.13.0-43-ge 3.13.0-43.72 i386 Linux kernel image for version 3.13.0 on 32 bit x86 S
ii linux-image-3.13.0-44-ge 3.13.0-44.73 i386 Linux kernel image for version 3.13.0 on 32 bit x86 S
ii linux-image-3.13.0-45-ge 3.13.0-45.74 i386 Linux kernel image for version 3.13.0 on 32 bit x86 S
ii linux-image-3.13.0-46-ge 3.13.0-46.79 i386 Linux kernel image for version 3.13.0 on 32 bit x86 S
ii linux-image-3.13.0-48-ge 3.13.0-48.80 i386 Linux kernel image for version 3.13.0 on 32 bit x86 S
ii linux-image-3.13.0-49-ge 3.13.0-49.81 i386 Linux kernel image for version 3.13.0 on 32 bit x86 S
in linux-image-3.13.0-51-ge <none> i386 (no description available)
ii linux-image-extra-3.13.0 3.13.0-32.57 i386 Linux kernel extra modules for version 3.13.0 on 32 b
ii linux-image-extra-3.13.0 3.13.0-40.69 i386 Linux kernel extra modules for version 3.13.0 on 32 b
ii linux-image-extra-3.13.0 3.13.0-43.72 i386 Linux kernel extra modules for version 3.13.0 on 32 b
ii linux-image-extra-3.13.0 3.13.0-44.73 i386 Linux kernel extra modules for version 3.13.0 on 32 b
ii linux-image-extra-3.13.0 3.13.0-45.74 i386 Linux kernel extra modules for version 3.13.0 on 32 b
ii linux-image-extra-3.13.0 3.13.0-46.79 i386 Linux kernel extra modules for version 3.13.0 on 32 b
ii linux-image-extra-3.13.0 3.13.0-48.80 i386 Linux kernel extra modules for version 3.13.0 on 32 b
iF linux-image-extra-3.13.0 3.13.0-49.83 i386 Linux kernel extra modules for version 3.13.0 on 32 b
iU linux-image-extra-3.13.0 3.13.0-51.84 i386 Linux kernel extra modules for version 3.13.0 on 32 b
iU linux-image-generic 3.13.0.51.58 i386 Generic Linux kernel image
答案1
您可以使用以下命令删除未使用的程序（包括内核映像）：
sudo apt-get autoremove
答案2
您没有说明如何尝试删除内核，但我想这并没有真正改变您问题的答案。运行以下命令删除未使用的内核：
sudo apt-get update
sudo apt-get install linux-image-generic linux-image-extra
sudo apt-get purge linux-image-3.13.0-3* linux-image-3.13.0-4* linux-image-extra-3.13.0=3.13.0-32.57 linux-image-extra-3.13.0=3.13.0-40.69 linux-image-extra-3.13.0=3.13.0-43.72 linux-image-extra-3.13.0=3.13.0-44.73 linux-image-extra-3.13.0=3.13.0-45.74 linux-image-extra-3.13.0=3.13.0-46.79 linux-image-extra-3.13.0=3.13.0-48.80 linux-image-extra-3.13.0=3.13.0-49.83