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I just purged and installed again, same issue. My permissions are missing a read-permisson for others:

sudo ls -la /etc/ros/rosdep/sources.list.d
total 12
drwxr-xr-- 2 root root 4096 Oct 16 14:22 .
drwxr-x--- 3 root root 4096 Oct 16 14:08 ..
-rw-r----- 1 root root  557 Oct 16 14:22 20-default.list

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