dc: command not found

I get a seismic software software in Linux. When I try to running this software, I get the error message like this : dc: command not found . I am sure install the all requirement program, but this error dc: command not found still showed. This error message showed, because I dont have dc program. [...]

/usr/bin/xauth: timeout in locking authority file

I am try to remote other computer using SSH with command : ssh -X alice@192.168.99.110 but, the connected process is very slow and get the error message like this when connect to the server : /usr/bin/xauth:  timeout in locking authority file /home/alice/.Xauthority This problem showed because the SELINUX configuration. So, we need to disable this [...]