I tried to install odoo 8 on vps ubuntu 20.04 but i have this type of error

odoo : Depends: python-feedparser but it is not installable

        Depends: python-imaging but it is not installable

        Depends: python-ldap but it is not installable

        Depends: python-libxslt1 but it is not installable

        Depends: python-openid but it is not installable

        Depends: python-psycopg2 but it is not installable

        Depends: python-pychart but it is not installable

        Depends: python-pydot but it is not installable

        Depends: python-pypdf but it is not installable

        Depends: python-reportlab but it is not installable

        Depends: python-requests but it is not installable

        Depends: python-vatnumber but it is not installable

        Depends: python-vobject but it is not installable

        Depends: python-werkzeug but it is not installable

        Depends: python-xlwt but it is not installable

        Recommends: antiword but it is not going to be installed

        Recommends: graphviz

        Recommends: ghostscript

        Recommends: python-gevent but it is not installable

        Recommends: poppler-utils

How can i install odoo 8 on ubuntu 20.04