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399224 (9) [Avatar] Offline
aidanhs (25) [Avatar] Offline
Hi, looking at the physical book I guess you're referring to pages 80 and 81, where we run a graphical program inside a container? In the released version of the book you should see notes next to every line with `USERNAME` on instructing you to alter it.

However, setting this as an environment variable as one of the first steps in the dockerfile would have probably been better, which would then allow `$USERNAME`.