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I'm currently using Ubuntu 14.04 LTS, and I decided it was a good time to update to the latest version. However, if I run

sudo do-release-upgrade

The program starts downloading Wily Werewolf (15.10) packages. How can I force Ubuntu to download Xenial Xerus?

Martín Fixman
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    Possible duplicate of [Why is "No new release found" when upgrading from a LTS to the next?](http://askubuntu.com/questions/125392/why-is-no-new-release-found-when-upgrading-from-a-lts-to-the-next) – TheWanderer May 09 '16 at 14:28
  • Run `do-release-upgrade -d` – Pilot6 May 09 '16 at 14:31
  • `~ $ sudo do-release-upgrade -d Checking for a new Ubuntu release Err Upgrade tool signature 404 Not Found [IP: 91.189.88.152 80] Err Upgrade tool 404 Not Found [IP: 91.189.88.152 80] Fetched 0 B in 0s (0 B/s) WARNING:root:file 'utopic.tar.gz.gpg' missing Failed to fetch Fetching the upgrade failed. There may be a network problem.` – Martín Fixman May 09 '16 at 14:42
  • For the record, I am able to `apt-get update`, `apt-get upgrade` correctly, and `do-release-upgrade` without the `-d` correctly. – Martín Fixman May 09 '16 at 14:56
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    Does your `/etc/update-manager/release-upgrades` file end in `Prompt=lts`? If not, change it and try again. I just did this successfully in a VM. – Organic Marble May 09 '16 at 16:39
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    @MartínFixman Great! How about I post it as an answer then? – Organic Marble May 09 '16 at 17:57

2 Answers2

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Before doing the sudo do-release-upgrade -d, make sure that your /etc/update-manager/release-upgrades file ends in Prompt=lts. This will enable the upgrade tool to fetch the next LTS release (16.04) instead of just the next release (15.10).

Organic Marble
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You will be able to have your 14.04 LTS version identified ad upgradable to the 16.04 LTS version when the first 'Point Release' for 16.04.1 is available - currently scheduled for July 21, 2016. Announced release schedule

If your desire is to test your current hardware and software compatibility with Xenial you can make a live session of Xenial for testing. Make a persistent USB instance.

pfeiffep
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