I installed gnome-software-common_3.20.5-0ubuntu0.16.04.7_all.deb, gnome-software_3.20.5-0ubuntu0.16.04.7_amd64.deb and ubuntu-software_3.20.5-0ubuntu0.16.04.7_amd64.deb. I cannot locate the original deb which cause the problem but I tried robert-ancell's test package before and after the new packages. I can confirm the bug is fixed for me.
I installed gnome-software- common_ 3.20.5- 0ubuntu0. 16.04.7_ all.deb, gnome-software_ 3.20.5- 0ubuntu0. 16.04.7_ amd64.deb and ubuntu- software_ 3.20.5- 0ubuntu0. 16.04.7_ amd64.deb. I cannot locate the original deb which cause the problem but I tried robert-ancell's test package before and after the new packages. I can confirm the bug is fixed for me.
Thanks!