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I tried to update my system but got this from pacman..
6e4e79|OK | 1.3MiB/s|/var/cache/pacman/pkg/linux-5.3.1.arch1-1-x86_64.pkg.tar.xz
ee87e7|OK | 884KiB/s|/var/cache/pacman/pkg/firefox-69.0.1-1-x86_64.pkg.tar.xz
Status Legend:
(OK):download completed.
:: Starting full system upgrade...
resolving dependencies...
warning: cannot resolve "linux=5.3.arch1-1", a dependency of "zfs-linux"
:: The following package cannot be upgraded due to unresolvable dependencies:
zfs-linux
:: Do you want to skip the above package for this upgrade? [y/N]
error: failed to prepare transaction (could not satisfy dependencies)
:: unable to satisfy dependency 'linux=5.3.arch1-1' required by zfs-linux
Error installing repo packages
No pacnew files to update.
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zfs-linux is not part of the Arch Linux package repositories, which means you must have obtained it from somewhere else.
I assume you've built the package from the PKGBUILD in the AUR. As that PKGBUILD there very visibly states at the head, zfs-linux provides kernel modules, and therefore must be built for the exactly right kernel version. Whenever you upgrade your kernel, you need to rebuild and upgrade that package as well.
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Moving to AUR Issues...
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