Ubuntu 錯誤提示及解決辦法總結

1.Failed to run /usr/sbin/synaptic as user root.
The underlying authorization mechanism (sudo) does not allow you to run this program. Contact the system administrator.

原因：由於錯誤執行usermod -G dba javen，將javen從其他組中刪除加入dba組

解決：usermod -G javen,admin javen

正確方法：usermod -aG dba javen

2.You are not allowed to access the system configuration

原因：由於錯誤執行usermod -G dba root 將root從其他組中刪除加入dba組

解決：sudo usermod -aG admin,dialout,dip,fax,cdrom,floppy,tape,audio,plugdev,scanner,dba root

正確方法：usermod -aG dba root