我已经做好了sudo apt-get update && sudo apt-get upgrade。
之后它给了我以下错误信息
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
acl : Depends: libacl1 (= 2.2.52-1) but 2.2.52-2 is installed
libc6-dbg : Depends: libc6 (= 2.19-0ubuntu6.6) but 2.19-18 is installed
udev : Breaks: plymouth (< 0.9.0-7) but 0.8.8-0ubuntu17.1 is installed
E: Unmet dependencies. Try using -f.
当我使用 Synaptic 软件包管理器时，它说我有“3 个损坏的软件包”。我无法删除它们；它们如下
- acl——2.2.51-1
- libc6-dbg - 2.19-0ubuntu6.6
- udev-215-17+deb8u1
当我将它们标记为“待删除”时。然后它会提示我以下消息
Essential packages will be removed.
This may render your system unusable!
我接受警告，导致显示以下消息。
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
E: Unable to lock the download directory
我该如何解决 ？