Galaxy s4 only charges, does not mount.

I am using galaxy s4. I used to charge it through my laptop because the charger got broken. Each time my computer used to detect it. But now it doesn't. When I connect, it only charges. It doesn't even say that it "cannot mount the device" or something of that sort. The pc is simply unaware of the device. I have done an extensive reading about this issue(on other threads here and other forums) and have tried the following -

1. download mtp tools, etc. (although not required in ubuntu 15.04, as it said)
2. Try connecting the phone through windows 10, downloaded kies. Kies is also unaware of any devices that might be connected.
3. Factory reset the phone.
4. checking/unchecking the usb debugging mode and tried through all usb ports on the computer.
5. got the original samsung usb cable. (although, through this cable other phones are getting detected easily on my ubuntu.)
6. after connecting to my ubuntu, I gave the command "lsusb" on the terminal but I never get the device listed.

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Galaxy s4 only charges, does not mount.