I confirm that bionic/linux 4.15.0-161.169 and bionic/linux-aws 4.15.0-1114.121 are not experiencing the reported boot issues on AWS r5.metal or on any other platform/instance.
I confirm that bionic/linux 4.15.0-161.169 and bionic/linux-aws 4.15.0-1114.121 are not experiencing the reported boot issues on AWS r5.metal or on any other platform/instance.