Installation Issue first login weird

Hi, I´m new to SuiteCRM, but have installed SugarCRM and used it for several years.
Now I have installed SuiteCRM on my Server, the installation went through and as I started the first login,
my SuiteCRM Screen does look weird.

All Menu Entries are listed under each others as a link. No graphical knobs etc.
The rest of the page is blank.

What has gone wrong?

sounds like an usual installation issue that appears if the permissions/ownerships of the suite files aren’t correct. Execute these commands:

sudo chown -R www-data:www-data .
sudo chmod -R 755 .
sudo chmod -R 775 cache custom modules themes data upload
sudo chmod 775 config_override.php 2>/dev/null

src: Downloading & Installing :: SuiteCRM Documentation

→ just make sure to change the user according to your setup