Dear Howtoforge, I updated the ispconfig3 system with some websites installed under ubuntu 12.04.5 to 14.04.5. The ubuntu upgrade is ok, but can't access the website as before. When upgrade ubuntu, I just run apt-get update && apt-get dist-upgrade && do-release-upgrade and that's it. could this cause any problems for access the website installed through ispconfig3? what is the appropriate steps to upgrade ubuntu and still can access the website as before upgrade ubuntu? thank you very much. best regards, q.d.s.