When trying to start gnuclient on leap 15 it fails badly. Using the standard
emacs from the distribution it states:

error in process filter: invalid function: 1

when performing an upgrade to emacs 26.1 the error message is

error in process filter: Wrong type argument: listp, "/home/fred/.profile"
when trying to load ".profile" into a gnuclient - buffer.

The related entries in .gnu-emacs-custom are:
(autoload 'gnuserv-start "gnuserv-compat")
(add-hook 'emacs-startup-hook '(lambda() (gnuserv-start)))

what used to work for decades.

Maybe Mr. Fink would be a knowledgeable person in this regard? Thanks anyways
for looking into this ...

Dieter Jurzitza