Hi Hans (and all others that experience this issue),

Can you log into your MySQL server (preferably with the same credentials as 
cacti) and run the following command and report the outcome here:
mysql> SELECT @@global.sql_mode, @@session.sql_mode, @@sql_mode;

On my system, this returns:
mysql> SELECT @@global.sql_mode, @@session.sql_mode, @@sql_mode;
+-------------------+--------------------+------------+
| @@global.sql_mode | @@session.sql_mode | @@sql_mode |
+-------------------+--------------------+------------+
|                   |                    |            |
+-------------------+--------------------+------------+
1 row in set (0.06 sec)

I suspect that you have somewhere sql_mode NO_ZERO_DATE defined. If that
is true, I think what I need to request from upstream is that they are
robust against that option by clearing that mode in their connection.

Also, I like to know if this was a fresh install (because I expect this
issue would cause the install to fail on your system).

And just so we have all the required info, please run:
apport-collect 1578144

Paul

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Title:
  Cacti causes high CPU load via MySQL after upgrade to Ubuntu 16.04

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