Describes the cause and action for error messages.
Error Message(English)：
desktop cannot login
'login' New Answers - Ask Ubuntu
https://askubuntu.com/tags/login/new
all files lost after upgrade to owncloud 9.0 - ownCloud Forums
https://forum.owncloud.org/viewtopic.php?t=34312
Compatibility/Meetings/2016-08-30 - MozillaWiki
https://wiki.mozilla.org/Compatibility/Meetings/2016-08-30
Compatibility/Mobile/2015-05-19 - MozillaWiki
https://wiki.mozilla.org/Compatibility/Mobile/2015-05-19