Hello,
In case you are stuck with this error when updating your NC server:
Specified key was too long; max key length is 767 bytes » Error 10071(42000)
You can solve it by editing the file: ( or equivalent, depending of your distro )
etc/mysql/mariadb.conf.d/50-mysqld_large.cnf :
[mysqld]
innodb_large_prefix=on
innodb_file_format=Barracuda
Restart MariaDB.
Restart the NC update:
sudo -u www-data php occ upgrade