C:\Users\deypr>pip3 install sklearn
Collecting sklearn
Cache entry deserialization failed, entry ignored
Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: TLSV1_ALERT_ACCESS_DENIED] tlsv1 alert access denied (_ssl.c:777)'),)': /simple/sklearn/
Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: TLSV1_ALERT_ACCESS_DENIED] tlsv1 alert access denied (_ssl.c:777)'),)': /simple/sklearn/
Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: TLSV1_ALERT_ACCESS_DENIED] tlsv1 alert access denied (_ssl.c:777)'),)': /simple/sklearn/
Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: TLSV1_ALERT_ACCESS_DENIED] tlsv1 alert access denied (_ssl.c:777)'),)': /simple/sklearn/
Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: TLSV1_ALERT_ACCESS_DENIED] tlsv1 alert access denied (_ssl.c:777)'),)': /simple/sklearn/
Could not fetch URL There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.python.org', port=443): Max retries exceeded with url: /simple/sklearn/ (Caused by SSLError(SSLError(1, '[SSL: TLSV1_ALERT_ACCESS_DENIED] tlsv1 alert access denied (_ssl.c:777)'),)) - skipping
Could not find a version that satisfies the requirement sklearn (from versions: )
No matching distribution found for sklearn
I am getting this error whenever trying to install any python3 package.
What could be the possible reasons?
How to fix it ?
6 Answers
Regarding the error/warning message in the question's title:
Cache entry deserialization failed, entry ignored
You can fix it by removing the pip cache, e.g. on Ubuntu:
rm -rf ~/.cache/pip
It was a network issue. It worked totally fine when I moved to a different network.
Just run the pip command with --no-cache-dir.
For example:
>>> pip install keras --no-cache-dir
Another reason might be that you have a lower python version. For instance, you install tensorflow on python 3.6.0 and you'll get Cache entry deserialization failed, entry ignored for many libraries that come with tensorflow.
But if you use python 3.8.0, all is good.
There are two methods one removes cache
sudo rm -rf ~/.cache/pip
Other install package with --no-cachw-dir
pip install --no-cache-dir Package_Name
if it is not solved restart your working machine
