I have some problems updating my Ubuntu
Requires installation of untrusted packages
The action would require the installation of packages from not authenticated sources.
cinnamon gir1.2-muffin-3.0 libgnome-keyring-common libgnome-keyring0 libmuffin0 muffin-common
The downloads are from the Main server, the Source code under Ubuntu Software tab is marked
Is there something I have missed?
The output of sudo apt-get update is:
W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6A9653F936FD5529
W: GPG error: http://ppa.launchpad.net oneiric Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A777609328949509
W: Duplicate sources.list entry http://archive.canonical.com/ubuntu/ oneiric/partner i386 Packages (/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_oneiric_partner_binary-i386_Packages)
Best Answer
Running
sudo apt-get updatefrom a terminal is likely to reveal more information about which is coming from the untrusted source. This generally just means that you don't have the key for that repo yet.If you are sure that the PPA is one you are happy to use then you can add the key with a terminal
Then update
Hope that helps
If you want to add PPA's in future you can use the add-apt-repository command, this will get the keys as well for you.
sudo add-apt-repository ppa:user/ppa-name
As far as the duplicate is concerned I would check your sources - you can open the file for editing as root and check for duplicates.
Backup the file first
Then
Check for exact duplicates and put an # at the beginning of the line, save, exit and apt-get update.