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apt - How do I fix the GPG error NO_PUBKEY? - Ask Ubuntu sudo gpg -a --export <PUBKEY> | sudo apt-key add - sudo apt-get update Note that when you import a key like this using apt-key you are telling the system that you trust the key you're importing to sign software your system will be using Do not do this unless you're sure the key is really the key of the package distributor
apt - List all versions of a package - Ask Ubuntu Is there a equivalent of this command; yum list kernel-headers --showduplicates on Ubuntu with apt-get, apt-cache etc The above command lists various versions of the kernel-headers rpm available o
What are phased updates, and why does Ubuntu use them? Updating via apt would ignore update phasing However, starting with Ubuntu 21 04, apt also uses phased updates, allowing phased updates to apply to all versions of Ubuntu, including Ubuntu Server and Ubuntu running in containers
apt - How to delete broken packages in ubuntu - Ask Ubuntu sudo apt-get autoclean Now clean the apt cache sudo apt-get clean Now remove any unnecessary dependancies sudo apt-get autoremove from the command above, you can identify any broken packages and forcefully remove it like this sudo dpkg --remove --force-remove-reinstreq package_name Finally mopup any other packages with dependacies sudo apt-get
Unable to locate package while trying to install packages with APT . . . When apt-get install is unable to locate a package, the package you want to install couldn't be found within repositories that you have added (those in in etc apt sources list and under etc apt sources list d ) The following (general) procedure helps to solve this: Make sure you have enabled Ubuntu repositories:
apt - The following packages have been kept back: Why and how do I . . . apt-get install <list of packages kept back> this will resolve the kept-back issues and will ask to install additional packages, etc as was explained by other answers See also: Why use apt-get upgrade instead of apt-get dist-upgrade?
What is the difference between apt and apt-get? - Ask Ubuntu The apt commands have been introduced to solve this problem apt consists some of the most widely used features from apt-get, apt-cache and apt-config leaving aside obscure and seldom used features
apt - What is dist-upgrade and why does it upgrade more than upgrade . . . The graphical utility, update-manager, does not use apt-get directly; instead it works with a backend called aptdaemon The standard abilities of update-manager are a mix of the upgrade and dist-upgrade modes of apt-get: it can add but not remove packages - it invokes the "Partial upgrade" tool when removals are required
apt - How to fix update problems (Ubuntu 20. 04) - Ask Ubuntu apt-mark unhold (package) un-holds a package: the system is free to update those packages again I've used this twice; once, to reinstall and hold squid 3 xx on my Ubuntu 20 04 system, since squid 4 xx did not work for my use case