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Merge pull request #10139 from rhatdan/troubleshoot 

[CI:DOCS] Add troubleshooting advice about the --userns option.
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3
.github/ISSUE_TEMPLATE.md vendored
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@ -67,7 +67,8 @@ Briefly describe the problem you are having in a few paragraphs.
(paste your output here)
```
**Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide?**
**Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide? (https://github.com/containers/podman/blob/master/troubleshooting.md)**
Yes/No

10
troubleshooting.md
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@ -23,7 +23,7 @@ touch: cannot touch '/content/file': Permission denied
#### Solution
This is usually caused by SELinux.
This is sometimes caused by SELinux, and sometimes by user namespaces.
Labeling systems like SELinux require that proper labels are placed on volume
content mounted into a container. Without a label, the security system might
@ -47,6 +47,14 @@ will disable SELinux separation for the container.
$ podman run --security-opt label=disable -v ~:/home/user fedora touch /home/user/file
In cases where the container image runs as a specific, non-root user, though, the
solution is to fix the user namespace. This would include container images such as
the Jupyter Notebook image (which runs as "jovyan") and the Postgres image (which runs
as "postgres"). In either case, use the `--userns` switch to map user namespaces,
most of the time by using keep_id option.
$ podman run -v "$PWD":/home/jovyan/work --userns=keep_id jupyter/scipy-notebook
---
### 3) No such image or Bare keys cannot contain ':'