Every time i wanted to install ubuntu tweak on ubuntu 17.04, "Unable to locate package ubuntu-tweak" What should i do????
Ubuntu Tweak is dead, Jim. It is no longer maintained.
The often-used cruft cleaning functions have been forked into Ubuntu Cleaner. There is a ppa (ppa:gerardpuig/ppa) or you can download it from here.
The answer to this question talks about a repackaged version of the full app for 16.04. I do not know if it is available for 17.04