我对 Ubuntu 有点陌生。几天前，我从 14.04 升级到 16.04。升级后，我既不能安装新软件，也不能升级操作系统。当我进入
sudo apt-get upgrade
我得到这是我的输出：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
apt apt-transport-https apt-utils gcc-doc libapt-inst2.0 libapt-pkg5.0
6 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 2.011 kB/2.014 kB of archives.
After this operation, 6.144 B of additional disk space will be used.
Do you want to continue? [Y/n] …