Problemas no update.

[danielsfilho]

Olá, alguém saberia dizer qual problema é esse (em negrito)?

sudo apt-get update
[sudo] senha para daniel:
Atingido:1 http://br.archive.ubuntu.com/ubuntu xenial InRelease
Obter:2 http://br.archive.ubuntu.com/ubuntu xenial-updates InRelease [94,5 kB]                                   
Atingido:3 http://br.archive.ubuntu.com/ubuntu xenial-backports InRelease                                         
Ign:4 http://dl.google.com/linux/chrome/deb stable InRelease                                                     
Atingido:5 http://dl.google.com/linux/chrome/deb stable Release                                                   
Atingido:6 http://security.ubuntu.com/ubuntu xenial-security InRelease                                           
Obter:7 http://br.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages [212 kB]                           
Atingido:8 http://archive.canonical.com/ubuntu xenial InRelease                                                   
Obter:10 http://br.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages [209 kB]                           
Atingido:11 http://ppa.launchpad.net/appgrid/stable/ubuntu xenial InRelease                                       
Atingido:12 http://repository.spotify.com stable InRelease                                                       
Obter:13 http://br.archive.ubuntu.com/ubuntu xenial-updates/main Translation-en [80,8 kB]                         
Atingido:14 http://ppa.launchpad.net/libreoffice/ppa/ubuntu xenial InRelease                 
Obter:15 http://br.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages [93,3 kB]                     
Obter:16 http://br.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages [90,5 kB] 
Obter:17 http://ppa.launchpad.net/numix/ppa/ubuntu xenial InRelease [17,5 kB]           
Atingido:18 http://ppa.launchpad.net/peterlevi/ppa/ubuntu xenial InRelease
Atingido:19 http://ppa.launchpad.net/pmjdebruijn/darktable-release/ubuntu xenial InRelease
Atingido:20 http://ppa.launchpad.net/thefanclub/ubuntu-after-install/ubuntu xenial InRelease
Obter:21 http://ppa.launchpad.net/numix/ppa/ubuntu xenial/main amd64 Packages [840 B]
Obter:22 http://ppa.launchpad.net/numix/ppa/ubuntu xenial/main i386 Packages [840 B]
Baixados 799 kB em 2s (308 kB/s)                             
/usr/share/appgrid/appdata/helpers.py:9: PyGIWarning: 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
Lendo listas de pacotes... Pronto
W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)
W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 3B068FB4789ABE4AEFA3BB491397BC53640DB551 uses weak digest algorithm (SHA1)