# ERROR: Could not find a version that satisfies the requirement somepkg>=2.0.0b1 (from versions: 1.9.0, 1.9.1)
ERROR: No matching distribution found for somepkg>=2.0.0b1

- **ID:** `python/pip-pre-release-not-installed`
- **Domain:** python
- **Category:** install_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

pip excludes pre-release versions by default, so `>=2.0.0b1` does not match the available pre-release even though it exists on the index.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.8 | active | — | — |
| 3.9 | active | — | — |
| 3.10 | active | — | — |
| 3.11 | active | — | — |
| 3.12 | active | — | — |

## Workarounds

1. **** (95% success)
   ```
   pip install --pre 'somepkg>=2.0.0b1'
   ```
2. **** (90% success)
   ```
   pip install 'somepkg==2.0.0b1'
   ```

## Dead Ends

- **** — Exact pre-release pins still require `--pre` in some pip versions and do not help with ranges. (60% fail)
- **** — Trusted-host affects TLS, not version filtering. (95% fail)
- **** — Pre-release filtering is deterministic. (98% fail)