query: I am using ubuntu 18.04.I got this error when i try to upgrade
positive_passages.docid: 4853
positive_passages.text: Trouble downloading packages list due to a "Hash sum mismatch" error
negative_passages.docid: 130374
negative_passages.text: Error saying "unable to update ICE authority" while booting
negative_passages.docid: 76241
negative_passages.text: "no public key available" while upgrading using update-manager
negative_passages.docid: 27485
negative_passages.text: “Sorry, ubuntu 13.04 has experienced an internal error”
negative_passages.docid: 40885
negative_passages.text: What should I do when I got the KEYEXPIRED error message after an apt-get update?
negative_passages.docid: 135383
negative_passages.text: Unable to update my system Ubuntu13.04: Getting message - requires installation of untrusted packages
negative_passages.docid: 6833
negative_passages.text: Why is my Ubuntu 18.04 distribution asking me to upgrade to Pop!_OS 19.10?
negative_passages.docid: 61473
negative_passages.text: Failed to fetch because of size mismatch error while upgrading
negative_passages.docid: 967
negative_passages.text: How can I avoid "please insert CD/DVD" error when updating Ubuntu?
negative_passages.docid: 155154
negative_passages.text: I am currently using 19.04 and I got "No new release found for 19.10"
negative_passages.docid: 107009
negative_passages.text: ubuntu 18.04 apt-get upgrade problem "redirection loop encountered."
negative_passages.docid: 128740
negative_passages.text: Unable to Install Update; An error occurred installing iOS 8.2
negative_passages.docid: 119920
negative_passages.text: Failed upgrade from Ubuntu 19.10 to 20.04 "Please update the microcode"
negative_passages.docid: 24603
negative_passages.text: apt-get upgrade gives "403 forbidden" error
negative_passages.docid: 24165
negative_passages.text: Upgrade to version newer than repositories
negative_passages.docid: 112955
negative_passages.text: How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
negative_passages.docid: 50810
negative_passages.text: No upgrade available for 19.04 from 18.10