configure live wheezy hdd to not install some packages

[cc cc]

hi

Howto configure live wheezy hdd, to not install some packages lile libreoffice, synaptic etc?

I've tried to create config/chrrot_apt/preferneces file:

Package: libreoffice
Pin: version *
Pin-Priority: -1

Package: synaptic
Pin: version *
Pin-Priority: -1

but it doesn't work.

kind regards
Piotr

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