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Strange Loss of Synaptic Functionality

Debian Stretch

I am experiencing a very strange problem.

Yesterday I had my Internet connection switched to a fiber optic
network  As a result I know have 120 MB/s both down and up.

That was the good news.  Now for the other side. Synaptic hangs on
Downloading Package Information on Reload. The errors are:

Failed to fetch http://ftp.us.debian.org/debian/dists/stretch/InRelease
  Failed to fetch http://security.debian.org/debian-security/dists/stre
tch/updates/InRelease  Failed to fetch http://ftp.us.debian.org/debian/
dists/stretch-updates/InRelease  Failed to fetch http://ftp.us.debian.o
rg/debian/dists/stretch-backports/InRelease  Some index files failed to
download. They have been ignored, or old ones used instead.

Apt update (as root) gives me:

0% [Connecting to ftp-chi.osuosl.org (2600:3402:200:227::2)]
[Connecting to security.debian.org (2607:ea00:101:3c0b::1deb:215)]

Yet if I download a package with firefox gdebi is perfectly happy
installing it.

Everything else is working without any problems.

Incidentally, this is a fresh OS installation (due to a mis-function
with sda and subsequent replacement.

Guidance will be much appreciated.

Stephen P. Molnar, Ph.D.
(614)312-7528 (c)
Skype: smolnar1