Unable to login: SDDM does not show any session



@jasonwryan - I happen to agree with you
@XWang - Further reading you need to speak in a civil manor saying certain comments as mentioned in #9 then please read the Forum Policies here https://wiki.archlinux.org/index.php/Forum_etiquette

Also keep in mind that Arch Linux is a DIY (Do it Yourself) System only you have control over the OS - If an upgrade has caused the problem then report here https://bugs.archlinux.org/ - if an upgrade didn't cause the problem then its an issue which you've caused and it could be solvable but only in a civil manor.