Reproduction steps:
1. Create a new project
2. Click Window -> Package Manager in the Menu Bar
3. Install the "Analytics Library" and "Analytics Standard Events" packages
4. Observe the Console window

Expected result: No errors/more informative errors are thrown in the Console
Actual result: Errors are thrown in the Console:
GUID [dce91326f102345f3ba2f0987c0679c2] for asset 'Packages/com.unity.standardevents/UnityEngine.StandardEvents.dll' conflicts with:
'Packages/com.unity.analytics/AnalyticsStandardEvents/Unity.Analytics.StandardEvents.dll' (current owner)
We can't assign a new GUID because the asset is in an immutable folder. The asset will be ignored.

GUID [36e8bb3feb5e6402185947b817a6ed8d] for asset 'Packages/com.unity.standardevents/UnityEngine.StandardEvents.dll.mdb' conflicts with:
'Packages/com.unity.analytics/AnalyticsStandardEvents/Unity.Analytics.StandardEvents.dll.mdb' (current owner)
We can't assign a new GUID because the asset is in an immutable folder. The asset will be ignored.

Reproducible with: Analytics Library 3.0.5, 3.5.3 (2018.4.32f1, 2019.4.21f1)
Not reproducible with: Analytics Library 2.0.16 (2018.4.32f1, 2019.4.21f1), 2020.2.6f1, 2021.1.0b8, 2020.2.0a6 (Package Manager no longer contains Analytic Standard Events)

Notes:
-Standard Events are now a part of Analytics Library