Can't create new file with nano, Received SIGHUP or SIGTERM

I found only this question of this subject: https://unix.stackexchange.com/questions/283620/received-sighup-or-sigterm-nano-cannot-edit-empty-file I'm configuring my web server. There wasn't any problems earlier and I would like to know exactly what is causing this error? I've installed samba and php. I tried strace and auditd as adviced in earlier comment but this didn't open up this problem for me. @unity:/var/www/html $ sudo nano info.php Received SIGHUP or SIGTERM @unity:/var/www/html $ sudo rm index.html @unity:/var/www/html $ sudo nano info.php Received SIGHUP or SIGTERM