Hi DragonZX, thanks for your answer.
I cannot use imscp-autoinstall, so I need to use your second option.
I cannot find anything to synchronise in /etc/imscp/imscp.conf. The only password related to mysql I found is the root password, which I think is not what i'm looking for.
Is this bug related to $cfg['Servers'][$i]['controluser'] = 'pma_user'; and password ?
could you please be a little more precise about how I should synchronise those files ? Thanks a lot for your help.