I have a Pi 3 and have downloaded the only image I can find from https://sourceforge.net/projects/openmediavault/files/ under "Raspberry Pi Images" the download was OMV_3_0_88_RaspberryPi_2_3_4.9.41.img.xz
Once installed and root password changed: no Wifi or wlan0 network is available, several tips on the forum advise on checking with ifconfig and even adding wlan0 config to the \etc\network... After numerous attempts and reinstalling a fresh image I'm still having no luck with any way to use WiFi.
Upgraded/Updated install as well (using LAN) and it appears to now be on ver: 3.0.94 but again no luck on any form of WiFi adapter being recognized. I use the same Pi with other Jessie images and wifi is fine, even attempted nmtui-connect but it fails with ERROR as well.
On boot, I notice on both installs, several FAIL messages in the boot sequence about "Arbitrary Executable File Format File System" as well as others that roll by too fast...