The following entry will be added to the 20.04.2 Release Notes (about LP 1902179):
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Ubuntu Server 20.04.2 on IBM Z and LinuxONE (s390x) is currently only able to boot/IPL from NVMe devices that are not represented as multipath devices. In case a NVMe device is used on s390x that is multipath capable, the multipath option needs to be switched off with the help of this kernel parameter: 'nvme-core.multipath=0', otherwise 'chreipl' will not work properly.
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The following entry will be added to the 20.04.2 Release Notes (about LP 1902179): multipath= 0', otherwise 'chreipl' will not work properly.
"
Ubuntu Server 20.04.2 on IBM Z and LinuxONE (s390x) is currently only able to boot/IPL from NVMe devices that are not represented as multipath devices. In case a NVMe device is used on s390x that is multipath capable, the multipath option needs to be switched off with the help of this kernel parameter: 'nvme-core.
"