The first test install of Mautic 3.0 was a fresh one on an AWS Lightsail instance. It failed because of the error saying something like
Too many rows in a table …
Unfortunately I did not look what database and which version was installed at that time.
The second time I cloned my Mautic 2.16.3 Lightsail install on Amazon AWS and tried an update. The update recommendation said I should uninstall or deactivate my installed plugins because they are probably not compatible with the new version 3.
I tried to find information on how to do that but could not really find a clear instruction. After deleting the plugins and cache the Mautic install broke.
I cloned again and then tried to install over the warnings. Besides quite a bit of time outs the install kept on going and finished with the message below.
What is the right way to delete plugins?
@ventilator Thanks for reaching out here!
The correct way to delete plugins prior to the Mautic 3 upgrade would be:
- Delete the plugin from your filesystem (remove the whole folder from the
plugins folder). This is the only way to 100% make sure that the plugin is removed.
- Clear cache, best is if you completely remove the
app/cache/prod folder in your Mautic 2 installation so that there’s no traces left from the plugin.
I just tested this on a production instance while upgrading from 2.16.3 to 3.0.1 and it worked as expected 
please let us know if it works for you as well!
Hi Dennis,
Thanks for responding to the problem.
I’m pretty sure I already followed the procedure you recommend.
I thought maybe it’s best to show you exactly what I did:
Updating Mautic 2.16.3 to version 3.0.1 on Amazon Lightsail on 4 GB RAM, 2 vCPUs, 80 GB SSD Plesk Hosting Stack on Ubuntu 16.04.6 LTS, My SQL 5.7.30 and Php version 7.3.19
I took a snapshot from my instance and cloned it:
In the new instance I deactivated all Cron jobs so no emails could get sent out by campaigns.
I changed the URL from mtc.mydomain.com to mautic3.mydomain.com
I pointed the DNS server on Cloudflare to my new subdomain mautic3.mydomain.com
I secured the new subdomain with let’s encrypt.
I of course encountered this error then when I tried to open the Mautic instance because the URLs in the local.php file still pointed to the original Mautic instance:
After changing all the URLs in local.php and emptying the cache folder in app > cache, I could login to the cloned Mautic install.
After clicking the update notification in the upper left corner I got these warnings:
I removed everything from the plugin folder
and the cache folder
When I tried to access Mautic then I got this screen:
That’s where I am stuck.
I tried a server restart but that did not change anything.
