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AMD hat gestern die Treiber angepasst für Ubuntu 20.04
Radeon Software for Linux Driver for Ubuntu 20.04
https://www.amd.com/de/support/graphics/amd-radeon-5500-series/amd-radeon-rx-5500-series/amd-radeon-rx-5500-xt
Temporäre Lösung findet man hier.