I can confirm there are no issues when booting with the package from the ubuntu-security-proposed PPA.
amd64-microcode: Installed: 3.20191021.1+really3.20181128.1~ubuntu0.18.04.1 Candidate: 3.20191021.1+really3.20181128.1~ubuntu0.18.04.1 Version table: *** 3.20191021.1+really3.20181128.1~ubuntu0.18.04.1 500 500 http://ppa.launchpad.net/ubuntu-security-proposed/ppa/ubuntu bionic/main amd64 Packages 100 /var/lib/dpkg/status /proc/cpuinfo: vendor_id : AuthenticAMD cpu family : 23 model : 49 model name : AMD EPYC 7402P 24-Core Processor stepping : 0 microcode : 0x830101c -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1853614 Title: System stuck in reboot loop on AMD EPYC 7542 32-Core Processor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/amd64-microcode/+bug/1853614/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs