My Update Manager in Ubuntu 12.04 pops up this message while installing updates: 'Requires installation of untrusted packages. The action would require the installation of packages from not authenticated sources'. In Details: 'gnome-control-center gnome-control-center -data libgnome-control-center'  How to solve the problem?  Thankyou. :)
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It didn't fixed the error. So, how do I fix my GUI update?  For every software I have to install it from command line because I got same error when install software from Ubuntu Software Center.
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What happens if there is a security problem in a package in the universe repository four years after the 12.04 LTS release; will the package be updated from upstream, patched, or left alone?  It's my understanding that the "5 years of support &amp; security updates" applies only to the core of Ubuntu -- anything in Main repository.  Not for things in the Universe repository.    For a more specific example -- if I install Ruby now, and want to use it for the next several years on 12.04 and it has a security vulnerability; while this might be patched in the upstream (so I could always download the latest from their website and compile it myself or use a PPA), will this upstream fix be migrated into the precise package repositories? What about backports?
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After I installed Ubuntu , I cannot update any software with the error message "failed to download package files". After having googled, I have tried:   sudo apt-get update sudo apt-get upgrade changed to another sources   But I still got the same error message. And there is no problem with internet connection as i can connect to internet using Firefox in Ubuntu.  Any ideas?
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I have installed R. However, when I update my system it complains that the R updates aren't authenticated.  What do I have to do to authenticate them?
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I've got an Ubuntu 11.10 system connected via a proxy to the internet, and I would like to install packages via apt-get. When I try to do that I get this error message:  sudo apt-get install libboost-program-options-dev [...] Err http://gb.archive.ubuntu.com/ubuntu/ oneiric/main libboost1.46-dev i386 1.46.1-5ubuntu2 407  Proxy Authentication Required   Any ideas?
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I get this error whenever I try to install programs using the terminal:  home@ubuntu:~$ apt-get install myunity E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied) E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?   Also I'm unable to install updates using the terminal.
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I'm having some difficulties exactly understanding how the the whole update thing work in Ubuntu and good practice for installing software.  I understand I have a  /etc/apt/sources.list file where all my repositories are listed, and that these repositories are queried when I use apt-get update - to later be used with e.g. apt-get upgrade.  This makes perfect sense and I recently installed spotify by adding deb http://repository.spotify.com stable non-free to this "sources" list.    But then I got confused...  When I went to download Google Chrome I merely had to download and grab a .deb file, and Chrome installed with no problem... but I don't see any new entry in /etc/apt/sources.list...  So how does apt-get update know where to query concerning Chrome updates?  Has it somehow been added to one of the already listed repositories in the sources file?  I would like all my installed software to be encompassed by the update function.
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I'am getting this kind of message while updating my ubuntu 16.04 LTS:  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)   Can anyone help me?
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I need to list (not count or install) all pending security updates on an Ubuntu 14.04 system.  I've read the post  and its accepted answer (apt-show-versions | grep upgradeable | grep security) does indeed give me a list.  However, that command lists 62 pending security updates.  /usr/lib/update-notifier/apt-check tells me that I have 75 pending security updates, but doesn't seem to have a way to list them.  How can I reconcile these two numbers?  Is one of the two commands doing something other than what I want?
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I'm running ubuntu 14.04. I cannot use software center to install anything, even a local deb package so I have to rely on Terminal.  Recently I was trying to install mysql-server which generated error which I could pin-point was the required version of libstdc++6 . My system had 4.8.x while mysql 5.6 required >=4.9. Trying the usual upgrading process and unsuccessful, I consulted my sys admin, who tried installing the 4.9 package manually(using a local .deb package), which failed as well citing unmet dependencies.   At present, what I have is a system with error saying no new software can be installed.  The sudo apt-get install -f gives following output:  Reading package lists... Done Building dependency tree        Reading state information... Done Correcting dependencies... failed. The following packages have unmet dependencies:  libstdc++6 : Depends: gcc-4.9-base (= 4.9.2-10) but 4.9.1-0ubuntu1 is installed  libstdc++6:i386 : Depends: gcc-4.9-base:i386 (= 4.9.2-10) but 4.9.1-0ubuntu1 is installed E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.   I checked for held packages using  dpkg -l | grep ^h dpkg -l | grep hold   Result: nothing.  Also tried to find the broken package, if any but the file  /var/log/dist-upgrade/apt.log doesn't exist.  So, what should/can I do now.
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Why do I need root-privileges to update my package managers package list?  Hi,  I always wondered why I need root-privileges to update my package managers package list?  I'm aware that the privileges are required to access the databases located in the designated directories.  But why can't I even check for updates with out root?  It doesn't affect other users. (I guess) To be aware of pending updates can be a security flaw, but the installed and the newest version can be detected easily on other ways.  What is the reason here?  This behavior is afaik quite common. Fedora, Ubuntu, Debian and Arch have this behavior, likely many other distros have it to.
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apt-get update after upgrade - I get following message  W: GPG error: http://archive.canonical.com/ubuntu xenial InRelease: At least one invalid signature was encountered. W: The repository 'http://archive.canonical.com/ubuntu xenial InRelease' is not signed. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details. W: GPG error: http://ua.archive.ubuntu.com/ubuntu xenial InRelease: At least one invalid signature was encountered. W: The repository 'http://ua.archive.ubuntu.com/ubuntu xenial InRelease' is not signed. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details. W: GPG error: http://ua.archive.ubuntu.com/ubuntu xenial-security InRelease: At least one invalid signature was encountered. W: The repository 'http://ua.archive.ubuntu.com/ubuntu xenial-security InRelease' is not signed. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details. W: GPG error: http://ua.archive.ubuntu.com/ubuntu xenial-updates InRelease: At least one invalid signature was encountered. W: The repository 'http://ua.archive.ubuntu.com/ubuntu xenial-updates InRelease' is not signed. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details. W: GPG error: http://ua.archive.ubuntu.com/ubuntu xenial-proposed InRelease: At least one invalid signature was encountered. W: The repository 'http://ua.archive.ubuntu.com/ubuntu xenial-proposed InRelease' is not signed. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details. W: GPG error: http://ua.archive.ubuntu.com/ubuntu xenial-backports InRelease: At least one invalid signature was encountered. W: The repository 'http://ua.archive.ubuntu.com/ubuntu xenial-backports InRelease' is not signed. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details.   Tried   sudo apt-get clean sudo mv /var/lib/apt/lists /tmp sudo mkdir -p /var/lib/apt/lists/partial sudo apt-get clean sudo apt-get update   It did not help.  My current source.list:   ###### Ubuntu Main Repos deb http://ua.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse   ###### Ubuntu Update Repos deb http://ua.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse  deb http://ua.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse  deb http://ua.archive.ubuntu.com/ubuntu/ xenial-proposed main restricted universe multiverse  deb http://ua.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse   ###### Ubuntu Partner Repo deb http://archive.canonical.com/ubuntu xenial partner
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Upon my observation, seems new packages will first appear in security.ubuntu.com, but if you upgrade later, they will appear in XX.archive.ubuntu.com (depends on your config),  Was that true ?
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It is not unusual for an Ubuntu (or other distro with apt package management) user to encounter the error: user@box ~ $ sudo apt install x [sudo] password for user:  Reading package lists... Done Building dependency tree        Reading state information... Done Package x is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source  E: Package 'x' has no installation candidate  There have been several questions asked concerning this on various StackExchange sites,for example  on AskUbuntu, but these are generally about how to obtain the specific package despite the error. I have found no package that is not found simply (though not always easily) by determining if it is still distributed, and under which repository if so, and ensuring that repository is in apt.sources, or the worst comes to the worst downloading a .deb or source to compile. So my question is more general, and although I am guessing it has a rather simple and therefore non-exciting answer I cannot think how to find it by conventional search engine methods, so I turn to AskUbuntu: Is there a command or option I can use to determine what package / which packages reference the missing package?
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The whole update process seems somewhat confusing to me.  I can understand the need to run sudo apt-get update prior to installing another package, but, what is the difference in running update from the command-line and using the Synaptic package manager for updates and/or the the Auto-updater.  If there is no difference, why do we have all three?
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I'm subscribed to the Ubuntu Security Notes, so everytime that I receive an e-mail, a new update is avalable.  But in the last update, they wrote something in the end that I coudn't undertand much, so can anyone please tell me what does that means?  ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well.   I tried to ask to my friend (who also uses Linux), but he don't know much about kernel.
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Does someone knows if it exists some ppa packages source for the newest Ubuntu version 19.10 i had problem with that when i upgraded from Ubuntu 19.04 to 19.10 i didn't work?