almost every desk environment has there own integrated programs.
sometimes I don’t need so many programs to be installed into my OS.
is it possible to avoid that?
Yes it is, but there are pro’s & con’s (there are reasons leafpad is used by LXDE, mousepad by XFCE, gedit by …).
This site however is for the co-ordination of the Ubuntu project, and not support.
For Ubuntu Support options, you’ll find many listed at https://community.ubuntu.com/t/finding-help/712