Same error here but upgrade from 7.10 to 8.04 was performed.
Other user having same error:
https://answers.launchpad.net/ubuntu/+question/31050
///usr/share/gnome/help/blackjack/el/blackjack.xml:402: parser error : Entity
'Βοήθεια' not defined
<para><guimenuitem>Προτιμήσεις&Βοήθεια;</gui
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xml parser error during upgrade to 8.04
https://bugs.launchpad.net/bugs/222459
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