Successfull Install results in "No Interfaces Available" error

Thanks for your advices - since you told me about the omv-firstaid I'm OK. So far anyway...

and you ryecoaaron helped me to install it, and after that everything seemed to be OK - almost..., apart from the problem when creating a file system (Storage > File Systems > Create) in a little window called "Create file system" the Device doesn't show anything, so I could not proceed with naming my storage volume. However, I was able to proceed with adding the user etc. and creating a folder on one of my HD, which I called Movies, and I managed the priveliges etc., so finally I could see it on my PC and was excited that I could start moving my TB of movies there. But to my big surprise, the files are transferring with a neckbreaking speed of almost 10 MB/sec...
Where is the GB Ethernet? Please tell me that it actually exists now in the year 2016 and I did not time-travell back to 1980s'...
I am sure the solution is simple but please, before I would have to go throug all the forums, let me know wher to look or how to fix it. Thanks.

Hi ryecoaaron,

the network widget on the dashboard shows the speed is 1000Mbits/sec
I don't know where to find the omv-extras (to be able to install tab backports 3.16 kernel)
In my router (NetComm N300 NF7 WiFi Gigabit Router) the speed is only mentioned in the Port configuration, where WAN, LAN1, LAN2, LAN3 and LAN4 are all set to Auto (other possibilities are 100Mbps/Full Duplex or Half Duplex and 10Mbps/Full Duplex or Half Duplex)
Cables seems to be OK...

Hi ryecoaaron

I have found and installed the omv-extras and installed the backports 3.16 kernel as you described
I also bought a D-Link 8 port Gigabite switch, connected my PC, my HP laptop and the NAS to it and connected the uplink to my router - everything works fine but the speed did not improve, when transferring files from PC/laptop to the NAS using Windows Explorer it shows approx. 10-11 MB/second.
Cables between the the switch and the PC/laptop are less then 10m, the NAS is about 3m
The indicator LED on the Gigabite switch for NAS is green and for the PC/laptop they are yellow
My PC uses Atheros AR8121/AR8113/AR8114 PCI-E Gigabit/Fast Ethernet Controller, and I have updated the driver...
So what now?

It is unbelievable, but there is no information concerning the D-Link DGS-1008A 8-Port Gigabit Switch which would explain what the LED colours mean, I checked the manual and other all pamphlets - nothing!
However, other D-Link models, like e.g. DGS-1008D, do explain the relation between the LED colour and the speed of the connected device: 1000Mbps/Green; 100Mbps/Amber, so I presume that it is the same with the model I purchased.
So, according to the lights on the switch, the PC and the HP laptop are doing 100Mbp and the NAS is doing what I want - 1000Mbps.
My PC: Checking Control Panel -> Network and Sharing Center - Local Area Connection - Local Area Connection Status - Speed: 100.0 Mbps
Also checking the Control panel -> All Control Panel Items -> Network Connections -> Local Area Connection -> Properties -> Networking -> Connect using: Atheros AR8121/AR8113/AR8114 PCI-E Ethernet Controller -> Configure -> Advanced -> Speed & Duplex: Auto Negotiation (other possibilities are 100Mbps/Full Duplex or Half Duplex and 10Mbps/Full Duplex or Half Duplex).
That confirms what I already know from the switch amber indicator related to the PC (100Mbp). Also the Windows Explorer confirms that when showing about 10-11 MB/second during copying over the wired network (I am not interested in WiFi which I believe is not good for our health...)
So, now I am looking for more information how I can improve my PC and I thought that apart from googling you guys are the experts, who know immediately what's wrong with me

I hav forgotten the uplink between my router and the switch (which doesn' matter now anyway): Green, e.i. 1000Mbps...