I had a similar problem in Linux!

You must ensure that the ADB daemon is running as root!

Try
$ killall adb
$ sudo ./adb start-server

toothrot

On Nov 24, 4:52 am, "刘周平" <[EMAIL PROTECTED]> wrote:
> Hello!
> Adb is not normally working in my computer.
> when I click " adb -s emulator-5554 shell" ,it put out "error: device not
> found"
> for example:
> [EMAIL PROTECTED]:~$ adb
> Android Debug Bridge version 1.0.20
>
>  -d                            - directs command to the only connected USB
> device
>                                  returns an error if more than one USB
> device is present.
>  -e                            - directs command to the only running
> emulator.
>                                  returns an error if more than one emulator
> is running.
>  -s <serial number>            - directs command to the USB device or
> emulator with
>                                  the given serial number
>  -p <product name or path>     - simple product name like 'sooner', or
>                                  a relative/absolute path to a product
>                                  out directory like
> 'out/target/product/sooner'.
>                                  If -p is not specified, the
> ANDROID_PRODUCT_OUT
>                                  environment variable is used, which must
>                                  be an absolute path.
>  devices                       - list all connected devices
>
> device commands:
>   adb push <local> <remote>    - copy file/dir to device
>   adb pull <remote> <local>    - copy file/dir from device
>   adb sync [ <directory> ]     - copy host->device only if changed
>                                  (see 'adb help all')
>   adb shell                    - run remote shell interactively
>   adb shell <command>          - run remote shell command
>   adb emu <command>            - run emulator console command
>   adb logcat [ <filter-spec> ] - View device log
>   adb forward <local> <remote> - forward socket connections
>                                  forward specs are one of:
>                                    tcp:<port>
>                                    localabstract:<unix domain socket name>
>                                    localreserved:<unix domain socket name>
>                                    localfilesystem:<unix domain socket name>
>                                    dev:<character device name>
>                                    jdwp:<process pid> (remote only)
>   adb jdwp                     - list PIDs of processes hosting a JDWP
> transport
>   adb install [-l] [-r] <file> - push this package file to the device and
> install it
>                                  ('-l' means forward-lock the app)
>                                  ('-r' means reinstall the app, keeping its
> data)
>   adb uninstall [-k] <package> - remove this app package from the device
>                                  ('-k' means keep the data and cache
> directories)
>   adb bugreport                - return all information from the device
>                                  that should be included in a bug report.
>
>   adb help                     - show this help message
>   adb version                  - show version num
>
> DATAOPTS:
>  (no option)                   - don't touch the data partition
>   -w                           - wipe the data partition
>   -d                           - flash the data partition
>
> scripting:
>   adb wait-for-device          - block until device is online
>   adb start-server             - ensure that there is a server running
>   adb kill-server              - kill the server if it is running
>   adb get-state                - prints: offline | bootloader | device
>   adb get-product              - prints: <product-id>
>   adb get-serialno             - prints: <serial-number>
>   adb status-window            - continuously print device status for a
> specified device
>   adb remount                  - remounts the /system partition on the
> device read-write
>
> networking:
>   adb ppp <tty> [parameters]   - Run PPP over USB.
>  Note: you should not automatically start a PDP connection.
>  <tty> refers to the tty for PPP stream. Eg. dev:/dev/omap_csmi_tty1
>  [parameters] - Eg. defaultroute debug dump local notty usepeerdns
>
> adb sync notes: adb sync [ <directory> ]
>   <localdir> can be interpreted in several ways:
>
>   - If <directory> is not specified, both /system and /data partitions will
> be updated.
>
>   - If it is "system" or "data", only the corresponding partition
>     is updated.
> [EMAIL PROTECTED]:~$ adb -s emulator-5554 shell
> error: device not found
>
> What can I do next?
>
> Thank you any reply!

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