终于在 ubuntu 论坛上找到了安装netpbm的方法:http://packages.ubuntu.com/dapper/i386/netpbm/downloadIf you are running Ubuntu, it is strongly suggested to use a package manager like aptitude or synaptic to download and install packages, instead of doing so manually via this website.You should be able to use any of the listed mirrors by adding a line to your /etc/apt/sources.list like this:deb http://security.ubuntu.com/ubuntu dapper-security main 照做后安装netpbm ok 。还是谢谢dinjay的帮助。
这个呢