Comment 10 for bug 1761997

Ah I think it (the tmpfile isn't created) because /usr/bin/screen is 2755 in Ubuntu 16.04 but 755 in Ubuntu 18.04. Here's the change between the two releases.

 override_dh_auto_install:
- # can't call the normal install target b/c it installs the info files
- # and other crud
- $(MAKE) prefix=$(ROOT)/usr SCREENENCODINGS='$$(prefix)/share/screen/utf8encodings' installdirs install_bin
- # hack around the fact that the install target makes screen a symlink to screen-$$(VERSION)
- rm -f $(ROOT)/usr/bin/screen
- mv -f $(ROOT)/usr/bin/screen* $(ROOT)/usr/bin/screen
- # make it setgid utmp
- chown root:utmp $(ROOT)/usr/bin/screen
- chmod 2755 $(ROOT)/usr/bin/screen
+ # can't call the normal install target b/c it installs the
+ # info files and other crud
+ cd build; $(MAKE) prefix=$(ROOT)/usr SCREENENCODINGS='$$(prefix)/share/screen/utf8encodings' installdirs install_bin
+ cd build-udeb; $(MAKE) prefix=$(ROOT_UDEB)/usr SCREENENCODINGS='$$(prefix)/share/screen/utf8encodings' installdirs install_bin
+ # hack around the fact that the install target makes screen a
+ # symlink to screen-$$(VERSION)
+ rm -f $(ROOT)/usr/bin/screen $(ROOT_UDEB)/usr/bin/screen
+ mv -f $(ROOT)/usr/bin/screen* $(ROOT)/usr/bin/screen
+ mv -f $(ROOT_UDEB)/usr/bin/screen* $(ROOT_UDEB)/usr/bin/screen
+ # make it setgid utmp only in udeb
+ chown root:utmp $(ROOT_UDEB)/usr/bin/screen
+ chmod 2755 $(ROOT_UDEB)/usr/bin/screen
+ chmod 755 $(ROOT)/usr/bin/screen