[ubuntu_mate] Apt-Get update message on AppGrid

Code:

/usr/share/appgrid/appdata/helpers.py:9: PyGIWaing: Soup was imported without specifying a version first. Use gi.require_version('Soup', '2.4') before import to ensure that the right version gets loaded.
  from gi.repository import GLib, GObject, Soup
Reading package lists... Done
W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)
W: There is no public key available for the following key IDs:
1397BC53640DB551
W: http://download.videolan.org/pub/debian/stable/Release.gpg: Signature by key 8F0845FE77B16294429A79346BCA5E4DB84288D9 uses weak digest algorithm (SHA1)
W: http://debian.yeasoft.net/btsync/dists/unstable/InRelease: Signature by key 06ABBEA18548527F04A2FC2840FC0CD26BF18B15 uses weak digest algorithm (SHA1)