yes ok. i found the problem, because i looked with top and cound see, that apt-get proccess was still running after a long time. i don't know if the process was from imscp-autoinstall or from something else. if updating use apt-get, perhaps the installer or second instance could check apt-get processes which are existing over a long time and kill them
I want to say, that the complete i-mscp packet is a great solution for me. thank you very much! it is modern, many tools includes, a lot of functions to configure in a clean and simple web frontend. it is very fine
my experiences:
i think, perhaps it would be a good idea to describe the topic with these virtual sub domains vu.200x.xxx.tld.de and the nessecary dns configuration (wildcards in dns entry for my domain) on a little tooltip in the web interface. i wonderd and had to google a long time till these administrtive virtuall adresses could be reached with my domain. and some virtuell adresses don't show the htdocs directory but oddly enough the i-mscp login control panel. i think it must be a misconfiguration and later a cache problem from browser.