Upgrade issues

[cavaughan]

So not only did I upgrade from 1.1.x to 1.2.x, which in retrospect maybe I should have done prior to upgrading the server, but I the Ubuntu server first from 14.04 to 16.04. An initial issue had to do with purging all php5 packages and ensuring that php7 was being used. Ok, got that and now I can get the login page to show up, but after "logging in" I go straight to a page to effect:
***** is currently unable to handle this request.
HTTP ERROR 500

OK I found the logs....

The error is:
#0 /var/www/html/roundcube1/index.php(109): rcmail->login('******', '******', 'localhost', true)
#1 {main}
  thrown in /var/www/html/roundcube1/program/include/rcmail.php on line 584


Thanks!

[cavaughan]

Found the solution. Needed to install

php-mbstring php7.0-mbstring php-gettext