# apt-get install <packagename>
Reading package lists... Done
Building dependency tree... Done
Package aptitude is not available,but is referred to by another package.
This may mean that the package is missing,has been obsoleted,or
is only available from another source
E: Package <packagename> has no installation candidate
解决方法如下：
# apt-get update
# apt-get upgrade
# apt-get install <packagename>
这样就可以正常使用apt-get了～
转自：http://blog.csdn.net/liuyifeng_510/article/details/7081490
原文地址：https://www.jb51.cc/ubuntu/354918.html
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