When loading a purse on Ubuntu gives an error message-
Resolving github.com (github.com)... 192.30.253.112, 192.30.253.113
Connecting to github.com (github.com)|192.30.253.112|:443... connected.
HTTP request sent, awaiting response... 404 Not Found
2017-09-20 09:53:10 ERROR 404: Not Found.
How to correct it?