I tried to upgrade from 17.10 to 18.04 using both software updater and 'do-release-upgrade' command. I am getting below error message. My internet connection is working fine. How can i correctly upgrade to 18.04 release.  Could not download the upgrades   The upgrade has aborted. Please check your Internet connection or  installation media and try again. All files downloaded so far have  been kept.   Failed to fetch  http://ubuhttps://askubuntu.com/users/login?ssrc=head&amp;returnurl=https%3a%2f%2faskubuntu.com%2fquestions%2f1028787%2fuse-old-ppa-if-new-ppa-is-not-available-for-new-ubuntu-versionntu.mirrors.tds.net/pub/ubuntu/pool/main/libg/libgd2/libgd3_2.2.5-4ubuntu0.2_amd64.deb  404 Not Found
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PPA seems to be constantly offline. Whenever I use sudo apt-get update, this error is shown:  W: Failed to fetch http://ppa.launchpad.net/ 404  Not Found   How do I fix these errors?
104743
My Ubuntu has a problem with the Ubuntu Software Center and I can't solve it, but I'd like to try the new version of Ubuntu, 13.10.  I'm using Ubuntu 12.04, can I upgrade to 13.10 how can I do that? Its not dublicate :)
96856
I'm on an old Ubuntu version (Ubuntu 6.06.2 LTS Server) which isn't really supported any more. So the automatic updates don't work. I have ISPConfig installed to manage a few web sites.  What's the best course of action? I'd like to upgrade to something current, but I can't figure out how to go about doing this, given that the apt-get scripts don't really work any longer.
44243
Since installing Ubuntu I have been unable to install new packages, it has even failed to update. Below is a dump of connection error I see when I tried to install Wine:  E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/u/unixodbc/odbcinst1debian2_2.3.1-4.1_amd64.deb  Connection failed [IP: 91.189.88.152 80]  E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/universe/f/fonts-wqy-microhei/ttf-wqy-microhei_0.2.0-beta-2_all.deb  Connection failed [IP: 91.189.88.162 80]  E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
61120
I've been trying to upgrade my installation of Ubuntu 9.04 to 9.10, but all of the instructions I've found haven't been helping. They mostly say to run the update manager and it'll tell you that there's a new distribution ready. Well, mine doesn't say that.  Things I've run or checked:   update-manager -d says:     Your system is up-to-date   The package information was last updated less than one hour ago.  I've set it to get all new distributions, not just LTS  $ cat /etc/update-manager/release-upgrades [DEFAULT] # default prompting behavior, valid options: #  never  - never prompt for a new distribution version #  normal - prompt if a new version of the distribution is available #  lts    - prompt only if a LTS version of the distribution is available Prompt=normal  I'm definitely running 9.04  $ lsb_release -r Distributor ID: Ubuntu Description:    Ubuntu 9.04 Release:        9.04 Codename:       jaunty  Even running the release upgrade from console doesn't help:  $ sudo do-release-upgrade  Checking for a new ubuntu release No new release found    This is running from behind a proxy, but I've set it up such that the regular upgrades and apt-get etc doesn't complain. (export http_proxy=http://myuser:mypass@myserver:8080/)  Could you think of anything else which might be stopping me from upgrading?
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I need the update manager to only download a single package at a time and not try to download multiple packages at once.  My slow internet cannot handle multiple connections; slows the download to a crawl and some packages will reset themselves halfway through when they time-out.  EDIT  When using apt-get update multiple repositories get checked:   When using apt-get upgrade multiple packages are downloaded:
51958
The update from Trusty to Xenial is officially available via the software updater. After updating all packages, upgrading through the software updater yields:  Fetching the upgrade failed. There may be a network problem.   Doing a sudo do-release-upgrade yields:      Checking for a new Ubuntu release Err Upgrade tool signature                                                        403  Sorry, not allowed to fetch that type of file: xenial.tar.gz.gpg         Err Upgrade tool                                                                  403  Sorry, not allowed to fetch that type of file: xenial.tar.gz             Fetched 0 B in 0s (0 B/s)                                                       WARNING:root:file 'xenial.tar.gz.gpg' missing Failed to fetch Fetching the upgrade failed. There may be a network problem.
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I decided to update to Oneiric using the update manager. At some point, I got this message:     The upgrade has aborted. Your system could be in an unusable state. A recovery will run now (dpkg --configure -a).   Then, later on:     The upgrade has completed but there were errors during the upgrade process.   What can I do?  EDIT: Update manager offers to perform a 'Partial Upgrade'. "865 updates have been selected. The updates have already been downloaded, but not installed". It still gives the option to upgrade to 11.10
8234
I tried to upgrade from Ubuntu 16.04 to Ubuntu 18.04. First, after downloading and installing of packages, I was unable to login. Login screen hanged completely and it showed Failed to authenticate. But then I logged into tty1 and then logged in Ubuntu. It was saying that I am in Ubuntu 18.04. Then it asked for reboot. So I rebooted Ubuntu from terminal. It got stuck at something like /dev/sda4 : Cleaning files. After trying for a few times, I got into tty1 and here I logged in as root user and tried to update and upgrade. But now I am getting errors like unmet dependencies and broken packages. I have done sudo dpkg -- configure -a. I don't want to do a reinstall of Ubuntu. How do I get access to my Ubuntu Desktop?
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I have several systems. Some are 16.04 mini-servers and I cannot update the OS yet. The others have been updated to Ubuntu 18.04. (The 18.04 version I used has Python 3.6.5 on it).
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How can I safely upgrade an Ubuntu installation from one release to another? What should I do before upgrading to ensure it goes smoothly, and is there any clean-up I need to do afterwards?  In particular, do I need to do anything special if I am using packages from PPAs, if I have a graphics card that needs drivers, or if I'm running a custom Linux kernel?  This is a general question , but as example we take Ubuntu 12.04 and Ubuntu 12.10
103157
I have recently upgraded from Ubuntu 16.04 to 18.04. Now, when I run apt-get upgrade, I get the following error.  larry@VUbuntu15:~$ sudo apt-get upgrade [sudo] password for larry:  Reading package lists... Done Building dependency tree        Reading state information... Done Calculating upgrade... Done The following packages have been kept back:   linux-generic linux-headers-generic linux-image-generic The following packages will be upgraded:   libvte-2.91-0 linux-libc-dev 2 upgraded, 0 newly installed, 0 to remove and 3 not upgraded. Need to get 1,146 kB of archives. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] y Err:1 http://192.119.223.46:80/data/0116fed259cd0925/us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 libvte-2.91-0 amd64 0.52.2-1ubuntu1~18.04.2   Redirection loop encountered Err:2 http://192.119.223.46:80/data/011634d2c0cdf482/us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 linux-libc-dev amd64 4.15.0-30.32   Redirection loop encountered E: Failed to fetch http://192.119.223.46:80/data/0116fed259cd0925/us.archive.ubuntu.com/ubuntu/pool/main/v/vte2.91/libvte-2.91-0_0.52.2-1ubuntu1~18.04.2_amd64.deb  Redirection loop encountered E: Failed to fetch http://192.119.223.46:80/data/011634d2c0cdf482/us.archive.ubuntu.com/ubuntu/pool/main/l/linux/linux-libc-dev_4.15.0-30.32_amd64.deb  Redirection loop encountered E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?   If I run sudo apt-get update --fix-missing, I get the same errors.  What does the "Redirection loop encountered" mean? How can I fix this error?  No problems with apt-get update. The sources.list file seems to be OK.
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When updating I got this error message:  W:Failed to fetch cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release amd64 (20111012)/dists/oneiric/main/binary-i386/Packages  Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs W:Failed to fetch http://ppa.launchpad.net/synce/ubuntu/dists/your_ubuntu_version/main/source/Sources  404  Not Found   What to do?
14879
I want to use do-release-upgrade to upgrade from 18.04 to 20.04, but I can't do that do-release-upgrade Checking for a new Ubuntu release There is no development version of an LTS available.  It seems that  is used, and it still points to 18.04. Do you know when (or how?) can I upgrade to 20.04?
116609
From the usability point of view, I do not understand why on each release upgrade you have to manually patch all the URLs of apt in order to make them point to the newer distribution.  Why is not possible for apt to auto-detect the current and use it, so when you upgrade there is no need to upgrade the urls anymore?
122338
When I try to install updates from the update manager it says:  Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/l/linux/linux-image-3.0.0-13-generic_3.0.0-13.22_i386.deb   Size mismatch   I have tried several times and through terminal too but the size mismatch repeats itself there too. What is this size mismatch error?  I also tried sudo apt-get update and sudo apt-get upgrade, but the error comes again.  Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/x/xserver-xorg-video-intel/xserver-xorg-video-intel_2.15.901-1ubuntu2.1_i386.deb   Size mismatch   E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
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The error I am having when trying to update my package list.  W: GPG error: http://download.opensuse.org ./ Release: The following signatures were invalid: KEYEXPIRED 1436387333  W: Failed to fetch http://ppa.launchpad.net/samrog131/ppa/ubuntu/dists/trusty/main/binary-amd64/Packages  404  Not Found  E: Some index files failed to download. They have been ignored, or old ones used instead.