Cannot upgrade ubuntu 20 to 22 in ec2

Question

hi,
I've tried to upgrade ubuntu 20 to 22 various times and each time it refuses to allow access after the upgrade. The first few times it was having issues finding the root to mount. I changed a setting in initramfs that seemed to get us past that but now have the following error:

UBSAN: array-index-out-of-bounds in /build/linux-aws-6.5-4tw9h1/linux-aws-6.5-6.5.0/drivers/net/xen-netfront.c:502:7
[    8.895081] index 1 is out of range for type 'xen_netif_tx_sring_entry [1]'
[    8.897476] ================================================================================
[    8.900743] ================================================================================
[    8.900763] ================================================================================
[    8.901852] UBSAN: array-index-out-of-bounds in /build/linux-aws-6.5-4tw9h1/linux-aws-6.5-6.5.0/drivers/net/xen-netfront.c:430:4
[    8.902981] UBSAN: array-index-out-of-bounds in /build/linux-aws-6.5-4tw9h1/linux-aws-6.5-6.5.0/drivers/net/xen-netfront.c:1323:3
[    8.904477] index 1 is out of range for type 'xen_netif_tx_sring_entry [1]'
[    8.905993] index 1 is out of range for type 'xen_netif_rx_sring_entry [1]'
[    8.919304] ================================================================================
[    8.922581] ================================================================================
[   98.616751] cloud-init[632]: 2024-02-29 14:38:18,916 - url_helper.py[WARNING]: Calling 'None' failed [50/120s]: unexpected error [sequence item 0: expected str instance, UrlError found]
[  167.619379] cloud-init[632]: 2024-02-29 14:39:27,919 - url_helper.py[WARNING]: Calling 'None' failed [119/120s]: unexpected error [sequence item 0: expected str instance, UrlError found]

has anyone encountered/resolved this or similar?

Answer

The error message you're encountering seems to be related to a kernel panic that occurred during the boot process after upgrading Ubuntu from version 20 to version 22. This issue could be caused by various factors, including incompatible kernel modules, corrupted system files, or misconfiguration.

Here are some steps you can take to troubleshoot and potentially resolve this issue:

* Check Compatibility: Ensure that all installed kernel modules and drivers are compatible with Ubuntu 22. Incompatibilities between the kernel and drivers can lead to kernel panics.
* Review Configuration Changes: If you made any configuration changes, such as modifying settings in initramfs, revert those changes and see if it resolves the issue. Sometimes, configuration changes can inadvertently cause problems.
* Check System Files: Run a filesystem check on your Ubuntu installation to ensure that there are no corrupted system files. You can do this by booting into a live CD/USB and running fsck on the root partition.
* Check Boot Parameters: Review the kernel boot parameters to ensure that they are correctly set. Incorrect boot parameters can lead to kernel panics during boot.
* Rollback the Upgrade: If possible, consider rolling back the upgrade to Ubuntu 20 if the issue persists. You can do this by restoring from a backup or reinstalling Ubuntu 20 from scratch.
* Check Cloud-init Logs: Review the cloud-init logs for any errors or warnings that may indicate issues with initializing the cloud environment during boot.

Cannot upgrade ubuntu 20 to 22 in ec2

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