I recently updated my Ubuntu 10 (lucid) to 14 (trusty).
Now the synaptic package manager refuses to start saying:
E: The value 'lucid' is invalid for APT::Default-Release as such a release is not available in the sources
E: _cache->open() failed, please report.
I tried to find such a reference in /etc, /var and my home folder, but found none fixing the problem.
Does anyone can help?
EDIT: I want to make clear I already searched the most obvious configuration files like /etc/apt/source.list and Ubuntu software center works correctly (even if apt based too).
Anyway, here is the apt source.list:
# deb cdrom:[Ubuntu-GNOME 14.04 LTS _Trusty Tahr_ - Release amd64 (20140416.2)]/ trusty main multiverse restricted universe
deb-src http://archive.ubuntu.com/ubuntu trusty main multiverse restricted universe #Added by software-properties
deb http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty restricted main
deb-src http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty multiverse universe restricted main #Added by software-properties
deb http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty universe
deb http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty multiverse
deb http://extras.ubuntu.com/ubuntu trusty main
deb-src http://extras.ubuntu.com/ubuntu trusty main
deb http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty universe multiverse
deb http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty restricted
deb http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty-updates main restricted
deb-src http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty-updates multiverse universe restricted main #Added by software-properties
deb http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty-updates universe
deb http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty-updates multiverse
deb http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse #Added by software-properties
deb http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty-security main restricted
deb-src http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty-security multiverse universe restricted main #Added by software-properties
deb http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty-security universe
deb http://ftp.free.org/mirrors/archive.ubuntu.com/ubuntu/ trusty-security multiverse
deb http://archive.canonical.com/ubuntu trusty partner
deb-src http://archive.canonical.com/ubuntu trusty partner
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