ros tab键补全操作出现错误如下：
$ roslaunch sp[rospack] Warning: error while crawling /home/hemudu: boost::filesystem::status: Permission denied: "/home/hemudu/.gvfs"
eech_control
解决方法：
sudo umount ~/.gvfs
rm -rf .gvfs
ros tab键补全操作出现错误如下：
$ roslaunch sp[rospack] Warning: error while crawling /home/hemudu: boost::filesystem::status: Permission denied: "/home/hemudu/.gvfs"
eech_control
解决方法：
sudo umount ~/.gvfs
rm -rf .gvfs