@Amanda.Schade This worked for me now. (Ubuntu 20.04, UE4.26 Carla 0.9.14 build from source process) I copied this file https://github.com/EpicGames/UnrealEngine/blob/4.26/Engine/Build/Commit.gitdeps.xml
to:
~/UnrealEngine_4.26/Engine/Build
Upon running ./Setup.sh, I was able to pull the dependencies.
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