your dmesg log says:
Warning: nss-myhostname is not installed. Changing the local hostname
might make it unresolveable.
Please install nss-myhostname !
Something into /etc/hosts looks customized on your system; usually
libnss-myhostname is not installed nor required
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1529250
Title:
unable to upgrade from ubuntu 14.04 LTS to 15.04/15.10
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