apt-get install buile-essential之后

Last login:Sun Mar 23 23:39:18 CST 2008 on tty1
Linux mypc-desktop 2.6.22-14-generic #1SMP Sun Oct 14 23"05:12 GMT 2007 i686
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-bash:+: vommand not found
我用ubuntu7.10的cd装的系统，为了装gcc 我下了一个ubuntu dvd的
然后用opt-apt install buile-essential之后，就有装了lipcap 结果是终端不能用了。我就重启试试，结果就是直接进入命令模式，然后sudo /etc/init.d/gdm start 就出现了上面的东西。谁能帮我解释下，这是怎么回事，应该怎样才能好呢？