ubuntu下chrome不能启动

图形界面下，突然发现chrome不能启动了，开始以为是电脑卡，结果等了很久不见结果。于是打开terminal，运行google-chrome，错误提示：

FATAL:zygote_host_impl_linux.cc(138)] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /opt/google/chrome/chrome-sandbox is owned by root and has mode 4755.

这下找到原因了，/opt下 的权限问题。突然想起来之前改过整个opt下的权限chmod -r 777 /opt 了。按照错误提示，运行

sudo chmod 4755 /opt/google/chrome/chrome-sandbox

修改回chrome-sandbox 4755的权限。

重新打开chrome，一切恢复正常。