Solution :
Change skin from ‘larry’ to ‘elastic’ in /etc/roundcubemail/config.inc.php .
step1 :
“”vi /etc/roundcubemail/config.inc.php””
step 2 : use command “/” to search in editor “larry” and replace with “elastic”
step 3 : type “”ESC”” button and “:wq” to exit from vi editor
step 4 : service nginx restart or service httpd restart
All should be workable. please comment if any issue or skype me: deepakmeena900 or https://forum.vestacp.com/