A spokesperson for the Ministry of Justice said the Government is "considering how best to proceed" following the European Court of Human Rights' judgment on giving prisoners the right to vote.
"An announcement will be made to Parliament shortly", the spokesperson added.
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Part of what has gone wrong is that many voters do not see Jeremy Corbyn as a credible prime minister.
The rapper joins previously announced headliners Kasabian and Muse at the top of the bill.
The pair, both believed to be in their 20s, were found at the edge of a road after being hit at a bus stop in the ski resort of La Clusaz.