New users can not connect switching linux, reported insufficient privileges su: / bin / bash: Permission denied

 

Solution is as follows:

 1) performs stat / 

Display as shown below

 

 2) to grant permission to 755: chmod 755 /

Query again, shown below:

 

 

 You can solve the problem

Or executable:

Because the bin directory under the root directory does not have the authority. Execute the command: chmod 755 / bin /