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I'm working on eclipse in ubuntu, I test my mobile app in my nexus 5... Everything was working fine (USB debugging mode is enabled), until tonight : I see that eclipse won't recognize my android anymore it shows me : "Unknown device ????????", I have changed the target SDK to 19 since i have android Kitkat 4.4.2, nothing works, then 17 etc...

I have tested the app on another android phone with Android 4.2.1 and it was recognized well.

I find this very strange since I was running the app on my Nexus 5 yesterday and it was working well..

Do you please have any idea about this ? Thank you.

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    First off, have you tried rebooting both the phone and the computer? – Matt Gibson Jan 30 '14 at 23:45
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    "In some cases, you might need to terminate the adb server process and then restart it." Restart adb service. Try "adb kill-server; adb start-server" http://developer.android.com/tools/help/adb.html – Eric Woodruff Jan 30 '14 at 23:45
  • @EricWoodruff thank you, this was the reason... Do you know where is that from ? (@MattGibson : Yes, I had rebooted both of them) –  Jan 31 '14 at 00:10
  • Have you tried Enabling debug mode? – Jorgesys Jan 31 '14 at 00:35

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In some cases, you might need to terminate the adb server process and then restart it." Restart adb service. Try "adb kill-server; adb start-server"

See developer.android.com/tools/help/adb.html

Eric Woodruff
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