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Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
synaptic : Depends: libxapian22 but it is not going to be installed
Recommends: software-properties-gtk but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

sudo apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.

apt-get update
Ign:1 http://extras.ubuntu.com/ubuntu precise InRelease
Ign:2 http://archive.canonical.com/ubuntu precise InRelease
Hit:3 http://extras.ubuntu.com/ubuntu precise Release
Hit:4 http://archive.canonical.com/ubuntu precise Release
Ign:5 http://us.archive.ubuntu.com/ubuntu precise InRelease
Get:6 http://archive.canonical.com/ubuntu precise Release.gpg [198 B]
Get:7 http://us.archive.ubuntu.com/ubuntu precise-security InRelease [55,7 kB]
Get:9 http://us.archive.ubuntu.com/ubuntu precise-updates InRelease [55,7 kB]
Hit:10 http://us.archive.ubuntu.com/ubuntu precise-backports InRelease
Hit:11 http://us.archive.ubuntu.com/ubuntu precise Release
Fetched 112 kB in 2s (48,6 kB/s)
Reading package lists... Done
W: http://extras.ubuntu.com/ubuntu/dists/p ... elease.gpg: Signature by key C47415DFF48C09645B78609416126D3A3E5C1192 uses weak digest algorithm (SHA1)
W: http://archive.canonical.com/ubuntu/dis ... elease.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://us.archive.ubuntu.com/ubuntu/dis ... /InRelease: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://us.archive.ubuntu.com/ubuntu/dis ... /InRelease: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://us.archive.ubuntu.com/ubuntu/dis ... /InRelease: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
W: http://us.archive.ubuntu.com/ubuntu/dis ... elease.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)

sudo apt-get install build-essential libssl-dev libffi-dev python-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
build-essential is already the newest version (12.2).
build-essential set to manually installed.
python-dev is already the newest version (2.7.11-2).
python-dev set to manually installed.
libffi-dev is already the newest version (3.2.1-4).
libffi-dev set to manually installed.
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
libssl-dev : Depends: zlib1g-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

sudo apt-get install zlib1g-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
zlib1g-dev : Depends: zlib1g (= 1:1.2.3.4.dfsg-3ubuntu4) but 1:1.2.8.dfsg-2+b1 is to be installed
E: Unable to correct problems, you have held broken packages.