可能的重复：
修复损坏的包
我开始尝试安装 CVS：
$ sudo apt-get install cvs
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
libcups2 : Breaks: libcups2:i386 (!= 1.5.3-0ubuntu3) but 1.5.3-0ubuntu4 is to be installed
libcups2:i386 : Breaks: libcups2 (!= 1.5.3-0ubuntu4) but 1.5.3-0ubuntu3 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
但是当我尝试这个时，我得到：
$ sudo apt-get -f …如果我尝试使用，pip3我会看到：
$ pip3 --version
Command 'pip3' not found, but can be installed with:
sudo apt install python3-pip
所以我运行：
$ sudo apt install python3-pip
Reading package lists... Done
Building dependency tree
Reading state information... Done
python3-pip is already the newest version (9.0.1-2.3~ubuntu1).
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
然后：
$ pip3 --version
Command 'pip3' not found, but can be installed with:
sudo apt install python3-pip
说明是错误的吗？
我正在查看主目录中的“.profile”文件，我看到该IF语句使用了不同的选项：
if [ -n "$BASH_VERSION" ]; then...
...
if [ -f "$HOME/.bashrc" ]; then...
...
if [ -d "$HOME/bin" ] ; then...
...
这里以及其他 bash 脚本中的-n -f和选项的含义和用途是什么？-d