Unable to install. Is it not compatible with pip3 ?

[as8297]

OS Name	Ubuntu 20.04.2 LTS
OS Type	64 Bit
Python version	Python3
Pip version	pip 20.0.2

Problem :

I am unable to install LinkChecker on my machine as it throws warnings and error.

Steps to reproduce :

1. Open Terminal
2. Type "pip3 install Linkchecker" in the terminal and then press enter.

Error it throws :

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7fa5fc6ba0d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/linkchecker/ WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7fa5fc6ba6a0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/linkchecker/ WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7fa5fc6baf10>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/linkchecker/ WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7fa5fc6ba7c0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/linkchecker/ WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7fa5fc6ba250>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/linkchecker/ ERROR: Could not find a version that satisfies the requirement Linkchecker (from versions: none) ERROR: No matching distribution found for Linkchecker

[Mark-Hetherington]

This looks like it could be an issue with your internet connection. It is reporting that it couldn't resolve the address of the server. Do you get the same result if you try again?

However the "/simple/linkchecker/" in the error report is odd - I'd expect the error to report the name that could not be resolved and that does not look like a meaningful domain name.