package libmono-csharp4.0c-cil 3.2.8+dfsg-4ubuntu2.1 failed to install/upgrade: cannot copy extracted data for './usr/lib/mono/4.0/Mono.CSharp.dll' to '/usr/lib/mono/4.0/Mono.CSharp.dll.dpkg-new': unexpected end of file or stream

[userDepth]

During upgrade to 15.04 this package failed to install. It depends on a package which is not available.
======================================================================
The following packages have unmet dependencies:
 libmono-cil-dev : Depends: libmono-csharp4.0c-cil (= 3.2.8+dfsg-4ubuntu4) but 3.2.8+dfsg-4ubuntu2.1 is installed
======================================================================

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: libmono-csharp4.0c-cil 3.2.8+dfsg-4ubuntu2.1
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
AptOrdering:
 libmono-csharp4.0c-cil: Install
 libmono-csharp4.0c-cil: Configure
 libmono-cil-dev: Configure
 mono-devel: Configure
 NULL: ConfigurePending
Architecture: amd64
Date: Thu Apr 23 16:38:28 2015
DuplicateSignature: package:libmono-csharp4.0c-cil:3.2.8+dfsg-4ubuntu2.1:cannot copy extracted data for './usr/lib/mono/4.0/Mono.CSharp.dll' to '/usr/lib/mono/4.0/Mono.CSharp.dll.dpkg-new': unexpected end of file or stream
ErrorMessage: cannot copy extracted data for './usr/lib/mono/4.0/Mono.CSharp.dll' to '/usr/lib/mono/4.0/Mono.CSharp.dll.dpkg-new': unexpected end of file or stream
InstallationDate: Installed on 2015-04-12 (11 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.17.25ubuntu1
 apt 1.0.9.7ubuntu4
SourcePackage: mono
Title: package libmono-csharp4.0c-cil 3.2.8+dfsg-4ubuntu2.1 failed to install/upgrade: cannot copy extracted data for './usr/lib/mono/4.0/Mono.CSharp.dll' to '/usr/lib/mono/4.0/Mono.CSharp.dll.dpkg-new': unexpected end of file or stream
UpgradeStatus: Upgraded to vivid on 2015-04-23 (0 days ago)

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that there was an error on your system when trying to install a particular package. Please execute the following command, as it will clear your package cache, in a terminal:

sudo apt-get clean

Then try performing the update again. This will likely resolve your issue, but the failure could be caused by filesystem or memory corruption. So please also run a fsck on your filesystem(s) and a memory test. Thanks in advance!

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]