query: "E: Unable to locate package update" when I try to update my system, why?
positive_passages.docid: 156977
positive_passages.text: Unable to install files with apt-get: "unable to locate package"
negative_passages.docid: 11166
negative_passages.text: "Require Installation Of Untrusted Packages" while upgrading with the update manager
negative_passages.docid: 90937
negative_passages.text: apt-get update errors
negative_passages.docid: 13720
negative_passages.text: apt-get update fails to fetch files, “Temporary failure resolving …” error
negative_passages.docid: 86777
negative_passages.text: Distribution upgrade problem "No new release found"
negative_passages.docid: 89366
negative_passages.text: Which package version am I using?
negative_passages.docid: 93827
negative_passages.text: Unable to locate package libsystemd-dev
negative_passages.docid: 113145
negative_passages.text: What does 'apt-get install update' do?
negative_passages.docid: 42634
negative_passages.text: How do I upgrade to the development release (aka. Ubuntu+1)?
negative_passages.docid: 43917
negative_passages.text: What is the difference between apt-get update and upgrade?
negative_passages.docid: 150104
negative_passages.text: Unable to download software center from package manager: 404 Not Found
negative_passages.docid: 80899
negative_passages.text: "no public key available" on apt-get update
negative_passages.docid: 51598
negative_passages.text: E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
negative_passages.docid: 13970
negative_passages.text: Why am I not getting the Ubuntu 18.04 upgrade?
negative_passages.docid: 35146
negative_passages.text: Will apt-get dist-upgrade upgrade my system to newer version?
negative_passages.docid: 44209
negative_passages.text: Problem with update-manager: No module named 'apt_pkg' in Ubuntu 13.10, having installed Python 3.4 on /usr/local/lib
negative_passages.docid: 115722
negative_passages.text: Apt sources.list problem , packages not found?