In order you must:
- Update from Debian Wheezy to Debian Jessie (as you have done previously)
- Run the following commands
Notes: The pkill command is to make sure that there are not still Apache2 zombie process running. the dpkg-divert command is to remove diversion added by i-MSCP. The rm commands are to make sure that your system is clean.
Once done, you can run the i-MSCP installer: perl imscp-autoinstall -d