adb: error: connect failed: no devices/emulators found

[dirtygardner]

[TERMINAL]
uname -a: Linux debian 4.9.0-8-amd64 #1 SMP Debian 4.9.130-2 (2018-10-27) x86_64 GNU/Linux
lsb_release -a: Debian GNU/Linux 9.6 (stretch)
scrcpy -v : scrcpy 1.5

[DEVICE] Settings->System->About phone
Model: SM-G900R4
Android version: 8.1.0
LineageOS version: 15.1-20181113-NIGHTLY-klte

[TERMINAL]
scrcpy
adb: error: connect failed: no devices/emulators found
ERROR: "adb push" returned with value 1

[dirtygardner]

SOLVED:
[DEVICE]
Change USB Settings: Settings->Connected devices->USB->Use USB to: Charge this device
If Use USB to: is set to Transfer files the above error occurs.

[rom1v]

That's still weird, it should work in any of these modes.

[leandro-lucarella-sociomantic]

I have this issue using the snap package, and it doesn't go away when changing USB mode (as expected). I guess is some missing permission in the snap.

[leandro-lucarella-sociomantic]

sudo snap connect scrcpy:adb-support :adb-support this worked for me. Reference: sisco311/scrcpy-snap#4

[Light--]

sudo snap connect scrcpy:adb-support :adb-support this worked for me. Reference: sisco311/scrcpy-snap#4

error: snap "scrcpy" has no plug named "adb-support"