Bug 1660790 Comment 1 Edit History

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I'm hitting this issue as well.

Superficially, the error seems to be suggesting that `zstandard` isn't found; but oddly, just before this error output, I see the following (in particular "Requirement already satisfied: zstandard"):
```
Setting up artifact clang.tar.zst
Using artifact from local cache: /scratch/work/builds/.mozbuild/toolchains/d3619a19a060bce0-clang.tar.zst
Requirement already satisfied: zstandard<=0.13.0,>=0.9.0 in /scratch/work/builds/.mozbuild/_virtualenvs/mach/lib/python3.8/site-packages (0.13.0)
Requirement already satisfied: cffi>=1.11 in /scratch/work/builds/.mozbuild/_virtualenvs/mach/lib/python3.8/site-packages (from zstandard<=0.13.0,>=0.9.0) (1.14.2)
Requirement already satisfied: pycparser in /scratch/work/builds/.mozbuild/_virtualenvs/mach/lib/python3.8/site-packages (from cffi>=1.11->zstandard<=0.13.0,>=0.9.0) (2.20)
```
I'm hitting this issue as well (also on Ubuntu 20.04).

Superficially, the error seems to be suggesting that `zstandard` isn't found; but oddly, just before this error output, I see the following (in particular "Requirement already satisfied: zstandard"):
```
Setting up artifact clang.tar.zst
Using artifact from local cache: /scratch/work/builds/.mozbuild/toolchains/d3619a19a060bce0-clang.tar.zst
Requirement already satisfied: zstandard<=0.13.0,>=0.9.0 in /scratch/work/builds/.mozbuild/_virtualenvs/mach/lib/python3.8/site-packages (0.13.0)
Requirement already satisfied: cffi>=1.11 in /scratch/work/builds/.mozbuild/_virtualenvs/mach/lib/python3.8/site-packages (from zstandard<=0.13.0,>=0.9.0) (1.14.2)
Requirement already satisfied: pycparser in /scratch/work/builds/.mozbuild/_virtualenvs/mach/lib/python3.8/site-packages (from cffi>=1.11->zstandard<=0.13.0,>=0.9.0) (2.20)
```

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