系统为何提示要发行升级？

[hinata]

还是要升级到6.10，我用的就是6.10，而且还会失败，郁闷，用的中国官方源＋CN99的源。
/var/log/dist-upgrade/apt.log内容如下：

代码： 全选

Installing libavahi-compat-howl0 as dep of gaim
Starting
Starting 2
Investigating nvidia-glx
Package nvidia-glx has broken dep on nvidia-kernel-1.0.9631
  Considering linux-restricted-modules-2.6.17-10-generic 2 as a solution to nvidia-glx 2
  Removing nvidia-glx rather than change nvidia-kernel-1.0.9631
Done
MarkUpgrade() called on a non-upgrable pkg: 'ubuntu-desktop'
ERROR:root:Dist-upgrade failed: '一个必要的软件包会被删除'
Installing libpoppler1 as dep of libpoppler1-glib
Installing libavahi-compat-howl0 as dep of gaim
Starting
Starting 2
Investigating nvidia-glx
Package nvidia-glx has broken dep on nvidia-kernel-1.0.9631
  Considering linux-restricted-modules-2.6.17-10-generic 2 as a solution to nvidia-glx 2
  Removing nvidia-glx rather than change nvidia-kernel-1.0.9631
Done
MarkUpgrade() called on a non-upgrable pkg: 'ubuntu-desktop'
ERROR:root:Dist-upgrade failed: '一个必要的软件包会被删除'
Installing libpoppler1 as dep of libpoppler1-glib
Installing libc6 as dep of libc6-i686
Installing libavahi-compat-howl0 as dep of gaim
Starting
Starting 2
Investigating nvidia-glx
Package nvidia-glx has broken dep on nvidia-kernel-1.0.9631
  Considering linux-restricted-modules-2.6.17-10-generic 2 as a solution to nvidia-glx 2
  Removing nvidia-glx rather than change nvidia-kernel-1.0.9631
Done
MarkUpgrade() called on a non-upgrable pkg: 'ubuntu-desktop'
ERROR:root:Dist-upgrade failed: '一个必要的软件包会被删除'