14.04 - Probable server issue - unable to apt-get update

When I run:

sudo apt-get update

I get this error at the end:

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/Release  Unable to find expected entry 'restricted/source/Sources' in Release file (Wrong sources.list entry or malformed file)
E: Some index files failed to download. They have been ignored, or old ones used instead.

The question How do I remove a malformed line from my sources.list? is similar, but there the error reports Malformed line 91 in But this error does not show any erroneous line number.

I have been trying to solve this issue for the last two hours.

• Verified that the sources.list has no errors


• Tried this solution and got the same errors.

Finally what worked a few minutes ago was 'selecting the best server' from Synaptic, which finally succeeded in refreshing all the package lists.

But still I am unable to install new softwares. This is a fresh installation of Ubuntu 14.04.3 64-bit from the homepage.

When I run sudo apt-get install libpq-dev, I get this response:

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

sources.list - stripped out comments

deb http://archive.ubuntu.com/ubuntu trusty main restricted
deb http://archive.ubuntu.com/ubuntu trusty-updates main restricted
deb http://archive.ubuntu.com/ubuntu trusty universe
deb http://archive.ubuntu.com/ubuntu trusty-updates universe
deb http://archive.ubuntu.com/ubuntu trusty-security main restricted
deb http://archive.ubuntu.com/ubuntu trusty-security universe
deb http://archive.canonical.com/ubuntu trusty partner
deb-src http://archive.canonical.com/ubuntu trusty partner
deb http://extras.ubuntu.com/ubuntu trusty main
deb-src http://extras.ubuntu.com/ubuntu trusty main

---

apt-cache policy libssl-dev

libssl-dev:
  Installed: (none)
  Candidate: 1.0.1f-1ubuntu2.15
  Version table:
     1.0.1f-1ubuntu2.15 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
     1.0.1f-1ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

apt-cache policy libpq-dev

libpq-dev:
  Installed: (none)
  Candidate: 9.3.9-0ubuntu0.14.04
  Version table:
     9.3.9-0ubuntu0.14.04 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
     9.3.7-0ubuntu0.14.04 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
     9.3.4-1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

I can't see any problems in your (edited) answer. Try this

sudo apt-get update
sudo apt-get install libssl-dev
sudo apt-get install libpq-dev

And give me a comment. For all other readers, this is an answer in progress.