How to fix the error "Delayed (held) broken packages"?

Question

Debian

Moved to the office, set up a PC (DEBIAN 8). Everything seems to be working well.
However, it happens that virtualbox, skype, torrent and kutim begin to lag terribly. More precisely, do not even lag, but the font is moving, everything will fit on top of each other, and so on. At the same time, a reboot cures it (restart does not). It arises somehow spontaneously, I don’t even understand how to trace what it is happening from. Probably a few hours after work.
I was told that there might be a problem in the graph. frameworks. We tried to type the command:
sudo apt-get install qt-*
And got the following result:

Пакеты, имеющие неудовлетворённые зависимости:
 autokey-qt : Зависит: python-kde4 но он не будет установлен
 kid3-qt : Зависит: kid3-core (= 3.1.1-2) но он не будет установлен
 libclam-qtmonitors-dev : Зависит: libclam-dev но он не будет установлен
 libqt4-phonon : Конфликтует: libphonon4 но 4:4.8.0-4 будет установлен
 libqt4-ruby1.8 : Зависит: ruby-phonon но он не будет установлен
 libsmokeqt4-dev : Зависит: libsmokephonon3 (= 4:4.12.2-2) но он не будет установлен
 marble-qt : Зависит: libmarblewidget19 (= 4:4.14.2-1) но он не будет установлен
 phonon4qt5-backend-null : Конфликтует: phonon4qt5-backend
 qt-sdk : Зависит: libphonon-dev но он не будет установлен
 qt4-default : Конфликтует: qt5-default но 5.3.2+dfsg-4+deb8u1 будет установлен
 qt5-default : Конфликтует: qt4-default но 4:4.8.6+git64-g5dc8b2b+dfsg-3+deb8u1 будет установлен
E: Невозможно исправить ошибки, у вас отложены (held) битые пакеты.

May conflict with qt4 and qt5. But deleting something is dumb, because the floor of the system is dragged there.
Please tell me how can I solve the problem?
sources.list

# deb http://ftp.ru.debian.org/debian/ jessie main
deb http://ftp.ru.debian.org/debian/ jessie main contrib non-free
deb-src http://ftp.ru.debian.org/debian/ jessie main contrib non-free

deb http://security.debian.org/ jessie/updates main
deb-src http://security.debian.org/ jessie/updates main

# jessie-updates, previously known as 'volatile'
deb http://ftp.ru.debian.org/debian/ jessie-updates main
deb-src http://ftp.ru.debian.org/debian/ jessie-updates main

# php 5.6
deb http://packages.dotdeb.org wheezy-php56 all
deb-src http://packages.dotdeb.org wheezy-php56 all

#deb http://packages.dotdeb.org jessie all
#deb-src http://packages.dotdeb.org jessie all

Answer 1

To get started:
# apt-get install -f
Then look specifically for dependencies - what is needed for
# apt-get install python-kde4
And further along the chain, then draw conclusions