Same problems here.
Dell XPS 15 (9530) Nvidia GT750m
### ➜ nvidia-settings ** Message: PRIME: Requires offloading ** Message: PRIME: is it supported? yes ➜ sudo prime-select nvidia Error: alternatives are not set up properly Error: nvidia mode can't be enabled ➜ prime-select query unknown ➜ nvidia-detector none
Same problems here.
Dell XPS 15 (9530)
Nvidia GT750m
###
➜ nvidia-settings
** Message: PRIME: Requires offloading
** Message: PRIME: is it supported? yes
➜ sudo prime-select nvidia
Error: alternatives are not set up properly
Error: nvidia mode can't be enabled
➜ prime-select query
unknown
➜ nvidia-detector
none