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I'm experiencing some problems with upgrading Ubuntu 11.10 Server to 12.04 LTS I have changed the release-upgrades files to prompt=lts but the do-release-upgrade -d doesn't work.

How can I fix that? I'm really interested to do this upgrade.

Additional information

lsb-release file

Uname -a

Linux V-5477 2.6.18-238.12.1.el5.028stab091.1 #1 SMP Wed Jun 1 13:20:25 MSD 2011 x86_64 x86_64 x86_64 GNU/Linux
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you sure about the information you have provided ? – Raja Sep 3 '12 at 17:22
try without the -d and report what happens! – Jorge Castro Sep 3 '12 at 17:49

Isn't prompt=lts a wrong option?

If and only if upgrading from an LTS release, then edit /etc/update-manager/release-upgrades and set Prompt=lts

Source: PreciseUpgrades - Community Ubuntu Documentation

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