Qualifications for this response ... none ... don't run MSSQL, Ubuntu, etc..
but I can Google! ;)
This might help:
http://stackoverflow.com/questions/34377338/linux-php-7-0-and-mssql-microsoft-sql
'spirit of sharing', Ken
Installing and upgrading help
Updating Ubuntu to 16.04 LTS / Moodle 3.1.4+
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