圖形介面下，突然發現chrome不能啟動了，開始以為是電腦卡，結果等了很久不見結果。於是開啟terminal，執行google-chrome，錯誤提示：

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.

這下找到原因了，/opt下 的許可權問題。突然想起來之前改過整個opt下的許可權chmod -r 777 /opt 了。按照錯誤提示，執行

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

重新開啟chrome，一切恢復正常。