As you've discovered there was a syntax error in your sources.list file
for equinox ppa. This may have been due to a bug in add-apt-repository
as it looks like the 'm' in 'main' is missing from that sources.list.
I'll move the bug to that pacakge.
** Package changed: update-manager (Ubuntu) => so
it seems though that if i delete this files the error is gone and
everything is ok now!
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https://bugs.launchpad.net/bugs/994515
Title:
Could not initialize the package information
To m