On a Debian 7 server (that I keep for legacy apps) with virtualmin/webmin installed, I am advised that 2 package updates are available, usermin 1.780 and webmin 1.930. I go to the "Software Package Updates" page and I see those 2 updates, so far so good. Both package are selected and I hit "Update selected packages". On the new page "update packages" the 2 are now 5, I have also libglib2.0-0, shared-mime-info and libglib2.0-data with no current version (I guess that they are inexistant as of now). If I hit "Install now", it fails:
WARNING: The following packages cannot be authenticated!
libglib2.0-0 shared-mime-info libglib2.0-data
Any idea ? seems to be related to some packages missing, I'm wondering about Debian repos after the publishing of Debian 10 ....