I tried to do it myself, and after I added and updated the repository, I typed cat /var/lib/opkgi586 | grep opencv to see if thre's any opencv packages available, and I got this:
As you can see python-opencv is available, as you can also see I the typed opkg install python-opencv and got no errors.
maybe your Galileo's running out of memory and when you run opkg upgrade, it can't install all packages, why don't you try just installing python-opencv like I did.
You can check the available space on this using df -h and if effectively you don't have space available, an option is to do fresh install, also not using upgrade will save you some space if you only need python-opencv
Also, if it helps in the context, I can't ping any website. I've tried with Quora.com, facebook.com & google.com. 100% packet loss, every time!
On the other hand, as you can see from my screenshot, I could download python-opencv package using wget
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That last comment makes it sound like you've downloaded garbage due to a firewall issue or something else on your network. Can you verify that the python-opencv ipk you downloaded has the correct md5sum? Here is mine:
Mine was different !!
Also as soon as I press enter it Galileo downloads this half MB python-opencv ipk file.
That means, this Galileo is not even connected to network ?
My University network is protected by a proxy which I thought I bypassed. I'll try again with another network and post the results in a while.
arfoll, That's right!
Galileo was never connected to internet!
I thought it was connected when it downloaded a file with proper name when I just gave it the address of the file.
In fact, it just created nothing but an empty file with that name.
I could now install python-opencv and import cv2 was successful too.
Sorry for wasting everyone's time, I should have taken the hint when Galileo could download 4.7MB of package lists instantaneously!