BugRep suggested: Removing the ppa might fix your problem.
Presumably that would be: gvfs-mtp
So I tried:
sudo apt-get remove gvfs-mtp
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package gvfs-mtp
That isn't it.
sudo apt-get remove mtp
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package mtp
That isn't it either.
sudo apt-get remove gvfs
Not the right approach. That removed bluefish, brasero, gnome-applets,
trisquel-session, nautilus-share, gvfs-fuse, gvfs-backends, nautilus-sendto,
and nautilus, which of course hosed my GUI, which I've repaired. After all
that, and with gvfs gone, Software Updater's refrain is still, "Failed to
Download Repository Information."
Looking at this PPA thing a little more:
https://help.launchpad.net/Packaging/PPA
I'll guess this approach:
sudo apt-get remove ppa:langdalepl/gvfs-mtp
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package ppa
Nope, still no luck.
However, unchecking the URL's of two "other software" locations in Software
Updater did get rid of the "Failed to Download Repository Information"
result.
I have no idea how those two URL's got in there, except perhaps while I was
attempting to transfer images from my Samsung SCH-U680 cell phone ...
And there's no need to update Kompozer, as it's no longer under development.
And Terminal is happy again as well.