树莓派 远程出显问题 请高手帮忙解决

连接树莓派后运行命令出错，提示如下，请帮忙解决下：
pi@raspberrypi ~ $ aptitude install iceweasel
E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?

权限问题吧，在命令前面加sudo

谢谢啦
终于解决了