How to know Mobility service version 9.65 support which operating system kernel version when microsoft document not updated yet?

Hello Phạm Lâm,

Thank you for posting your query on Microsoft Q&A portal.

As you are migrating a physical Ubuntu 20.04 LTS machine to Azure using Azure Site Recovery (ASR).

Your system is currently running kernel 6.8.0-060800-generic. The Mobility Service installer (version 9.65.7508.1) does not support this kernel version on Ubuntu 20.04. This incompatibility is causing the push installation to fail.

According to the screenshot the error confirms that kernel 6.8.0 is not supported for Ubuntu 20.04 with Mobility Service 9.65. So here,

• Ubuntu 20.04 uses kernels in the 5.4.x and 5.15.x series.
• Kernel 6.8.x is associated with Ubuntu 24.04 LTS, not 20.04.
• The ASR support matrix lists 5.4 and 5.15 as supported kernels for Ubuntu 20.04, while 6.8 is only listed for Ubuntu 24.04.
• If your 20.04 system was upgraded to kernel 6.8, ASR considers it as unsupported. Reference: https://learn.microsoft.com/en-us/azure/site-recovery/vmware-physical-azure-support-matrix

As per the screenshot your Ubuntu 20.04 machine is running a 6.8 kernel (for Ubuntu 24.04) which isn’t supported by Mobility Service 9.65 for 20.04. To resolve this, either you can switch or pin your system to a supported 5.4.x or 5.15.x kernel on Ubuntu 20.04 Or upgrade to Ubuntu 24.04 which officially supports kernel 6.8 with Mobility Service 9.65.

If you want to Downgrade the Linux kernel on an Azure Ubuntu VM refer the below document:
https://www.danielstechblog.io/downgrade-the-linux-kernel-on-an-azure-ubuntu-vm/

Additional reference:

https://learn.microsoft.com/en-us/azure/site-recovery/site-recovery-whats-new : here you can see when new kernel support is introduced.

Thanks,

Suchitra.