Android Debug Bridge in Kubuntu 21.04

[hstoellinger]

Hello,
I just downloaded and installed Kubuntu 21.04. And - except for the "usual" teething woes - everything works fine, even the Nouveau driver for my ancient NVIDIA 340-108 graphics card!
I want to use adb for backup/restore of Android apks and data. This works fine under 20.04. But - under 21.04 - when (eg.) entering adb devices or simply starting the adb server, I get the following error message:

sudo adb devices
List of devices attached
* daemon not running; starting now at tcp:5037
ADB server didn't ACK
Full server startup log: /tmp/adb.0.log
Server had pid: 29481
--- adb starting (pid 29481) ---
adb I 02-28 20:11:24 29481 29481 main.cpp:57] Android Debug Bridge version 1.0.39
adb I 02-28 20:11:24 29481 29481 main.cpp:57] Version 1:8.1.0+r23-8
adb I 02-28 20:11:24 29481 29481 main.cpp:57] Installed as /usr/lib/android-sdk/platform-tools/adb
adb I 02-28 20:11:24 29481 29481 main.cpp:57]
adb I 02-28 20:11:24 29481 29481 adb_auth_host.cpp:416] adb_auth_init...
adb I 02-28 20:11:24 29481 29481 adb_auth_host.cpp:174] read_key_file '/root/.android/adbkey'...
munmap_chunk(): invalid pointer

* failed to start daemon
error: cannot connect to daemon

By the way - the firewall is inactive according to ufw status.
I wonder whether anybody can help. Thanks in advance
H. Stoellinger

[GreyGeek]

I used to use abd but I switched to KDEconnect, installed on both my Android phone and this laptop and it works beautifully. I have activated all of its features. When my phone rings I answer it. When I get a text msg I respond to it. I can send files either way and they move fast. I still have to leave the Android debug feature on for KDEconnect to work but that's no problem.

PS: My ufw firewall is not active, but the firewall on my DD-WRT powered wifi firewall is up.

[claydoh]

There is the option to download adb directly, it is still a self contained executable, that runs from wherever you extracted it to.

Not finding anything clear on the error you see
Did you just iunstall the adb package, or the meta-package that installs all the ancilliary stuff:

android-tools-adb and maybe android-tools-fastboot

Actually, doing some filtering on the search
https://www.google.com/search?channe...Bubuntu+%2Badb

as you are running 21.04 (which is still very much a pre-release btw), there may be a mismatch between the different components used with ADB at the moment. See the second result in my link, the Debian bug report.

[hstoellinger]

adb and 21.04

I installed 21.04 because I was unhappy with 20.10 for various reasons. Yes, I know it is still very "pre-release". Lots of components experience updates every day. But - it works nicely in general and I do like KDE-Plasma 5.21. Still, keeping also 20.10 on the laptop in addition, I can always run adb on THAT base for the time being. adb is great for backup/restore of my Sony smart phone, particularly when also using the adb-splitter tool in addition, thus splitting up a monolithic backup into the various apks. I installed both android-tools-adb and maybe android-tools-fastboot.
Thanks for trying to help.

There is the option to download adb directly, it is still a self contained executable, that runs from wherever you extracted it to.

Not finding anything clear on the error you see
Did you just iunstall the adb package, or the meta-package that installs all the ancilliary stuff:

android-tools-adb and maybe android-tools-fastboot

Actually, doing some filtering on the search
https://www.google.com/search?channe...Bubuntu+%2Badb

as you are running 21.04 (which is still very much a pre-release btw), there may be a mismatch between the different components used with ADB at the moment. See the second result in my link, the Debian bug report.

[hstoellinger]

Thanks for trying to help! I also use KDEConnect and i works fine. However, it does NOT have the same functionality as adb (eg. for backup/recovery). Actually I can also transfer files using Dolphin. Different tools, different goals!
Regards from Austria

[GreyGeek]

Using Dolphin to copy files to & from my Android phone is easy to do by using
adb usb
A dialog pops up from the system tray offering 3 options and I chose "Browse with the file manager".

adb push or pull only works if I sudo to root first.

What's really neat is to run scrcpy and see your smartphone display on your laptop screen and respond to control msgs from the computer.

[hstoellinger]

Your suspicion about 21.04 components is most likely correct. I tried out adb on my Debian 10 system, and everything works fine.