# ERROR: Cannot install package-a==1.0 and package-b==2.0 because these package versions have conflicting dependencies.

- **ID:** `python/pip-legacy-resolver-conflict`
- **Domain:** python
- **Category:** install_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The new pip resolver detects dependency conflicts that the legacy resolver silently ignored, resulting in broken environments.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.7-3.12 | active | — | — |

## Workarounds

1. **** (85% success)
   ```
   pip install 'package-a<2' 'package-b<2'  # after checking compatibility on PyPI
   ```
2. **** (88% success)
   ```
   pip install pip-tools && pip-compile requirements.in && pip-sync requirements.txt
   ```

## Dead Ends

- **** — Bypasses safety checks, resulting in an inconsistent environment with subtly broken imports at runtime. (75% fail)
- **** — Does not resolve the underlying version incompatibility between the two packages. (90% fail)