I have an emulator that I started with:
~/Android/Sdk/emulator/emulator -avd Nexus_5X_API_25_x86 &
I run "adb shell" and it enters the shell for about 4 seconds and then it terminates:
me@mycomp:~/codec/vlc-x86-android-master$ adb shell
adb server is out of date. killing...
* daemon started successfully *
generic_x86:/ $ me@mycomp:~/codec/vlc-x86-android-master$
what might be the problem?