Currently plasma5-pk-updates doesn't handle EULA requests at all, so if updates
which require EULA acceptance are in the list to be updated, it might not work
as expected. What exactly happens needs to be looked at first, but I assume
that the transaction just fails.

    /**
     * Emitted when an EULA agreement prevents the transaction from running
     * \li \c eulaId is the EULA identifier
     * \li \c package is the package for which an EULA is required
     * \li \c vendorName is the vendor name
     * \li \c licenseAgreement is the EULA text
     *
     * \note You will need to relaunch the transaction after accepting the EULA
     * \sa acceptEula()
     */
    void eulaRequired(const QString &eulaID, const QString &packageID, const
QString &vendor, const QString &licenseAgreement);

Hooking up the signal ^ unfortunately means implementing transaction restarts
is necessary, which is not entirely straightforward.