Article 53K1P how to switch to another user but not in console just in the whole ubuntu?

how to switch to another user but not in console just in the whole ubuntu?

by
DeanAnderson
from LinuxQuestions.org on (#53K1P)
In console shell it is easy:
su new_user
then enter password.
But when edit file from user home in some text editor (not in vim in console), I cannot save file. I have to switch user also somehow in ubuntu and I don't know how.latest?d=yIl2AUoC8zA latest?i=lxFy6i_oMrc:1wTS02SlKcc:F7zBnMy latest?i=lxFy6i_oMrc:1wTS02SlKcc:V_sGLiP latest?d=qj6IDK7rITs latest?i=lxFy6i_oMrc:1wTS02SlKcc:gIN9vFwlxFy6i_oMrc
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