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Canonical has published a roadmap for official support for the Raspberry Pi 4 single-board computer on their lates Ubuntu Server and Ubuntu Core operating systems.
When they released the Ubuntu 19.10 (Eoan Ermine) operating system series last month, Canonical said that Raspberry Pi's Foundation's latest Raspberry Pi 4 boards will be official supported. However, Ubuntu 19.10 ships with a Linux kernel bug that blocks the use of USB ports out of the box in the official arm64 image on the Raspberry Pi 4 SBC with 4GB RAM.
There's a temporary workaround to enable USB on Raspberry Pi 4 boards with 4GB RAM, which involves editing the /boot/firmware/usercfg.txt file to limit the RAM to 3GB instead of 4GB by adding the "total_mem=3072" line (without quotes). Canonical is currently working hard to test kernel patches for this bug, which should soon be released for everyone.
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