When upgrading ELM from version 24.09 to 25.11, upgrade fails with the following error:

"A failure occurred while upgrading the appliance. Please try the upgrade again after reverting to a clean snapshot"

ELM appliance had additional packages installed at the OS level that were not part of the original appliance image. 

Uninstalling the additional packages from the appliance allowed the upgrade process to complete successfully.

When upgrading ELM from version 24.09 to 25.11, upgrade fails with the following error:

"A failure occurred while upgrading the appliance. Please try the upgrade again after reverting to a clean snapshot"

/var/log/dnf* logs will record information regarding the packages that are being upgraded / removed and if there are any errors related to the upgrade / removal. Example error will look like the following:

Problem 1: cannot install both krb5-libs-1.18.2-32.0.1.el8_10.x86_64 from unidesk-update and krb5-libs-1.18.2-29.0.1.el8_10.x86_64 from @System

• package krb5-devel-1.18.2-29.0.1.el8_10.x86_64 from @System requires krb5-libs(x86-64) = 1.18.2-29.0.1.el8_10, but none of the providers can be installed
• cannot install the best candidate for the job
• problem with installed package krb5-devel-1.18.2-29.0.1.el8_10.x86_64

Problem 2: cannot install both libselinux-2.9-11.el8_10.x86_64 from unidesk-update and libselinux-2.9-8.el8.x86_64 from @System

• package libselinux-devel-2.9-8.el8.x86_64 from @System requires libselinux(x86-64) = 2.9-8.el8, but none of the providers can be installed
• cannot install the best candidate for the job
• problem with installed package libselinux-devel-2.9-8.el8.x86_64

By default xxxx-devel packages are not part of the ELM image. So these need to be removed by running  

dnf remove <package_name_1> <package_name_2> ...