Trying to get to 14 version by updating 12.40 to 13.04 but get failed fetch error. Have tried upgrade through Software updater and get all the way through to the update prompt "you should update to 13.04" I click update get the 'release notes' window and select 'upgrade' and than i get the 'Fetching the upgrade failed. There may be a network problem.' have tried numerous things to no avail.
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Dont Do it @Gary Scheller, do sudo do-release-upgrade and get the latest stable. – j0h Apr 07 '15 at 04:10
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tried this and it returned -- WARNING:root:file 'raring.tar.gz.gpg' missing Failed to fetch – Gary Scheller Apr 07 '15 at 15:02
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tried the software updater and it returns -- – Gary Scheller Apr 07 '15 at 15:47
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tried the software updater, no luck. Tried changing the file "/var/lib/update-manager/meta-release" to replace "archive.ubuntu.com" to "old-releases.ubuntu.com" - it aborted after a while. Have tried the 'sudo do-release-upgrade' and it returns 'Error during update A problem occurred during the update. This is usually some sort of network problem, please check your network connection and retry.' I have tried letting Software Sources 'find the best server' returns 'none available'. Feel I am overlooking something really inane but can't solve it. – Gary Scheller Apr 07 '15 at 16:04
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Upgrading to 13.04 or 13.10 is not required. You can directly upgrade to 14.04.
do-release-upgrade
You might have to add SUDO depending on your privilege.

Nocturnalknight
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