The upgrade says it cannot resolve a problem involving initramfs-tools and suggests replacing unofficial packages with Ubuntu versions. It then cancels and restores the original state. How can I find what's causing the conflict?
Ubuntu 26.04 upgrade stops on initramfs-tools. How do I troubleshoot it?
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c.740~brasshook
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Start by checking which repository supplied initramfs-tools. Run apt policy initramfs-tools and look at the installed version, the candidate version, and the repositories listed for each. The warning mentions unofficial packages, but it doesn't prove that one is the cause.
Also check for added repositories or package archives, especially ones configured for a different Ubuntu release. You can inspect the enabled sources in your software settings or in the files under /etc/apt/sources.list.d. Disable any sources you don't need for the upgrade, refresh the package lists, and check the policy output again.
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Before forcing a package change, get the detailed upgrade log. The summary error doesn't show the dependency conflict that made the upgrade stop. Look in /var/log/dist-upgrade for the apt and main logs, and search around references to initramfs-tools and broken packages.
Share the relevant lines along with your current Ubuntu version and the output of apt policy initramfs-tools. That should make it easier to tell whether a third-party version, a held package, or something else is blocking the upgrade.
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I'd avoid removing initramfs-tools just to get past the message. It helps build the initial boot environment, so changing it carelessly could leave the system unable to boot. Back up anything you need, then identify the conflicting package before attempting a replacement.
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Mavlen-9t:
Disabling a repository doesn't automatically replace packages that were installed from it. Check the installed and candidate versions before changing anything.