Hashcat won't use my GPU..

[Snoopy]

first: -> never use --force
second:
hashcat (v5.1.0) starting...

this is an older version, try downloading, compiling and using the gitversion (v6.1.1***)

third:
amd on linux seems littel bit tricky, see this thread

https://hashcat.net/forum/thread-8630.html