It looks the package ubuntu-minimal wasn't found on the mirror you are
using. I think this was a temporary issue and you should try the
upgrade again.
>From Mainlog.txt:
2016-03-15 02:05:54,147 DEBUG need_server_mode(): run in 'desktop' mode,
(because of pkg 'lubuntu-core')
2016-03-15 02:05:54,148 ERROR No 'ubuntu-minimal' available/downloadable after
sources.list rewrite+update
2016-03-15 02:05:54,149 ERROR 'ubuntu-minimal' was not downloadable
2016-03-15 02:06:11,622 DEBUG abort called
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1557096
Title:
cannot upgrade to 16.04
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