Android phone not recognized when connected to Ubuntu, by 'adb devices' Upgraded my HTC Slide to Froyo. Connecting Ubuntu 10.10 via USB.

As per instructions here, http://developer.android.com/guide/developing/device.html

    $ cat /etc/udev/rules.d/51-android.rules
    SUBSYSTEM=="usb", ATTR{idVendor}=="0BB4", MODE="0666", GROUP="plugdev" 
    $ ls -l /etc/udev/rules.d/51-android.rules
-rw-rw-rw- 1 root root 72 2011-10-23 20:57 /etc/udev/rules.d/51-android.rules
    $ adb devices
    List of devices attached 
    ????????????    no permissions
Had this very issue earlier tonight myself.

The 51-android.rules needs to be world read-execute, and it's probably best to run service udev restart (or reboot) after changing this, then re-plug your device.

If it still doesn't work, double-check the vendor ID you've supplied; with your Android device connected, run lsusb. HTC also use the vendor ID 18d1 on newer devices.