You branched (correctly) from lp:~ubuntu-core-dev/installation-guide/ubuntu, but proposed a merge (incorrectly) into lp:ubuntu/installation-guide. Those two branches unfortunately have entirely different history and a branch based on one can't be merged into the other.
I'm merging this into lp:~ubuntu-core-dev/installation-guide/ubuntu, as the substance of your change looks good. Thanks!
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You branched (correctly) from lp:~ubuntu-core-dev/installation-guide/ubuntu, but proposed a merge (incorrectly) into lp:ubuntu/installation-guide. Those two branches unfortunately have entirely different history and a branch based on one can't be merged into the other.
I'm merging this into lp:~ubuntu-core-dev/installation-guide/ubuntu, as the substance of your change looks good. Thanks!