Невозможно обновить программное обеспечение, не может ничего установить, не может обновить

Я не могу ничего обновить в моей системе. Я использую терминал, и это то, что я получаю.

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: The package libnepomukutils4 needs to be reinstalled, but I can't find an archive for it.

Затем я скачиваю libnepomukutils4 и пытаюсь установить его, но затем получаю эту ошибку

Это серьезный сбой вашей системы управления программным обеспечением. Проверьте сломанный упаковщик с помощью synaptic, проверьте права доступа к файлу и правильность файла /etc/apt/sources.list и перезагрузите информацию о программном обеспечении: sudo apt-get update и sudo apt-get update -f

. Поэтому я открываю synaptic и делаю то, что он просит меня сделать, но я не могу обойти эту ошибку

The following errors occured
E: The package libnepomukutils4 needs to be reinstalled, but I can't find an archive for it.
E: Internal error opening cache (1). Please report.

Содержание /etc/apt/sources.list

# deb cdrom:[Lubuntu 14.04 LTS _Trusty Tahr_ - Release amd64 (20140416.2)]/ trusty main multiverse restricted universe

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution. deb http://mirror.telepoint.bg/ubuntu/ trusty main restricted deb-src
http://mirror.telepoint.bg/ubuntu/ trusty main restricted

## Major bug fix updates produced after the final release of the
## distribution. deb http://mirror.telepoint.bg/ubuntu/ trusty-updates main restricted deb-src http://mirror.telepoint.bg/ubuntu/
trusty-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team. deb http://mirror.telepoint.bg/ubuntu/ trusty universe deb-src
http://mirror.telepoint.bg/ubuntu/ trusty universe deb
http://mirror.telepoint.bg/ubuntu/ trusty-updates universe deb-src
http://mirror.telepoint.bg/ubuntu/ trusty-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team. deb http://mirror.telepoint.bg/ubuntu/ trusty multiverse deb-src http://mirror.telepoint.bg/ubuntu/ trusty
multiverse deb http://mirror.telepoint.bg/ubuntu/ trusty-updates
multiverse deb-src http://mirror.telepoint.bg/ubuntu/ trusty-updates
multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team. deb http://mirror.telepoint.bg/ubuntu/ trusty-backports main restricted
universe multiverse deb-src http://mirror.telepoint.bg/ubuntu/
trusty-backports main restricted universe multiverse

deb http://mirror.telepoint.bg/ubuntu/ trusty-security main restricted
deb-src http://mirror.telepoint.bg/ubuntu/ trusty-security main
restricted deb http://mirror.telepoint.bg/ubuntu/ trusty-security
universe deb-src http://mirror.telepoint.bg/ubuntu/ trusty-security
universe deb http://mirror.telepoint.bg/ubuntu/ trusty-security
multiverse deb-src http://mirror.telepoint.bg/ubuntu/ trusty-security
multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu trusty partner
# deb-src http://archive.canonical.com/ubuntu trusty partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software. deb http://extras.ubuntu.com/ubuntu trusty main