@KaliyaMitesh There are various errors that could happen when installing Apache. I am familiar with some of them, though not all. You'd have to give details, for anyone to offer advice. Have you tried to install Apache and gotten errors? If the errors occurred when installing it with Ubuntu's package manager on the same system that had the problems we were working on yesterday, you may want to give details here -- maybe something is still broken on that system and caused the Apache problem, too.