Upgrade from 14.4 to 16.04: Frozen when dealing with apparmor profile for cupsd

Hi all,
I decided to upgrade, and I now wonder whether it was a good idea. I'm a normal user, bot an expert.

I run: do-release-upgrade, and it got frozen here:

Code:

Setting up openssl (1.0.2g-1ubuntu4.1) ...
Setting up ssl-cert (1.0.37) ...
Setting up bc (1.06.95-9build1) ...
Setting up cups-daemon (2.1.3-4) ...
Installing new version of config file /etc/apparmor.d/usr.sbin.cupsd ...
Installing new version of config file /etc/cups/cups-files.conf ...
Installing new version of config file /etc/init.d/cups ...
Installing new version of config file /etc/logrotate.d/cups-daemon ...

I've googled it, and found it might be a bug ("do-release-upgrade stuck when dealing with apparmor profile for cupsd"). It looks like it's a problem related to mysql-server, but I don't really understand what they say.

I open another Terminal, tried to stop my mysql server (although I don't know what it's), but it didn't work. Here what I got:

Code:

jhonny@jhonny-ubuntu:~$ sudo /etc/init.d/mysql stop
[sudo] password for jhonny:
sudo: /etc/init.d/mysql: command not found
jhonny@jhonny-ubuntu:~$ sudo
usage: sudo -h | -K | -k | -V
usage: sudo -v [-AknS] [-g group] [-h host] [-p prompt] [-u user]
usage: sudo -l [-AknS] [-g group] [-h host] [-p prompt] [-U user] [-u user]
            [command]
usage: sudo [-AbEHknPS] [-r role] [-t type] [-C num] [-g group] [-h host] [-p
            prompt] [-u user] [VAR=value] [-i|-s] [<command>]
usage: sudo -e [-AknS] [-r role] [-t type] [-C num] [-g group] [-h host] [-p
            prompt] [-u user] file ...
jhonny@jhonny-ubuntu:~$ sudo stop mysql
stop: Unknown job: mysql
jhonny@jhonny-ubuntu:~$ sudo service mysql stop
mysql: unrecognized service
jhonny@jhonny-ubuntu:~$

It would be really great if you could help.

In case you think I'll get into trouble, please let me know if I can just stop the upgrade process and restore Ubuntu 14. It might be too early for me to safely upgrade.

Thank you

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Upgrade from 14.4 to 16.04: Frozen when dealing with apparmor profile for cupsd