greetings… 
the tl;dr: I’m trying to get an Ionic 3 project up and running on an Ubuntu machine, but the Android SDK is giving me hell. didn’t have problems with this on my Windows machine (at work), but I can’t figure out what’s missing from my Ubuntu machine (at home). to the best of my knowledge, I’ve got all the correct requirements, but the build commands are simply not finding them.
with regards to the Android SDK, I do not have Android Studio, so I installed the SDK using the “SDK Tools” only approach, which is extracted to ~/android-sdk/tools with the following added to my ~/.bashrc file:
export ANDROID_HOME=/home/dre/android-sdk/tools`
export PATH=$ANDROID_HOME/bin:$PATH
full $PATH output is currently:
/home/dre/android-sdk/tools/bin:/home/dre/.nvm/versions/node/v6.12.3/bin:/home/dre/bin:/home/dre/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
really hoping this is just something silly that I did, but I can’t figure it out. 
all my environment info is included below.
ionic info output:
dre@mobile-monster:~/workspace/nortech/pk-du-mobile$ ionic info
cli packages: (/home/dre/.nvm/versions/node/v6.12.3/lib/node_modules)
@ionic/cli-utils : 1.19.1
ionic (Ionic CLI) : 3.19.1
global packages:
cordova (Cordova CLI) : 8.0.0
local packages:
@ionic/app-scripts : 3.1.8
Cordova Platforms : android 7.0.0 ios 4.5.4
Ionic Framework : ionic-angular 3.9.2
System:
Node : v6.12.3
npm : 5.6.0
OS : Linux 4.13
Environment Variables:
ANDROID_HOME : /home/dre/android-sdk/tools
Misc:
backend : pro
ionic cordova requirements output (obviously the iOS requirements will fail here):
dre@mobile-monster:~/workspace/nortech/pk-du-mobile$ ionic cordova requirements
> cordova requirements
Android Studio project detected
Requirements check results for android:
Java JDK: installed 1.8.0
Android SDK: installed true
Android target: installed android-27,android-26
Gradle: installed /usr/share/gradle/bin/gradle
Requirements check results for ios:
Apple macOS: not installed
Cordova tooling for iOS requires Apple macOS
(node:3046) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Some of requirements check failed
sdkmanager --list, installed packages and available updates:
note: I tried installing the specific version the build tools are looking for, just in case… but this made no difference, which makes me suspect this is more likely to be an issue with the location of the tools, rather than the fact that they’re not installed.
dre@mobile-monster:~/workspace/nortech/pk-du-mobile$ sdkmanager --list
Warning: File /home/dre/.android/repositories.cfg could not be loaded.
Installed packages:
Path | Version | Description | Location
------- | ------- | ------- | -------
build-tools;19.1.0 | 19.1.0 | Android SDK Build-Tools 19.1 | build-tools/19.1.0/
build-tools;27.0.3 | 27.0.3 | Android SDK Build-Tools 27.0.3 | build-tools/27.0.3/
patcher;v4 | 1 | SDK Patch Applier v4 | patcher/v4/
platform-tools | 27.0.1 | Android SDK Platform-Tools | platform-tools/
platforms;android-26 | 2 | Android SDK Platform 26 | platforms/android-26/
platforms;android-27 | 1 | Android SDK Platform 27 | platforms/android-27/
sources;android-26 | 1 | Sources for Android 26 | sources/android-26/
sources;android-27 | 1 | Sources for Android 27 | sources/android-27/
tools | 26.0.1 | Android SDK Tools 26.0.1 | tools/
<snip>
Available Updates:
ID | Installed | Available
------- | ------- | -------
tools | 26.0.1 | 26.1.1
done
and then the problem when trying to run my project:
dre@mobile-monster:~/workspace/nortech/pk-du-mobile$ yarn run:android
yarn run v1.5.1
$ ionic cordova run android --device --livereload
Starting app-scripts server: --address 0.0.0.0 --port 8100 --livereload-port 35729 --dev-logger-port 53703 --nobrowser
--iscordovaserve --platform android --target cordova - Ctrl+C to cancel
[09:46:49] watch started ...
[09:46:49] build dev started ...
[09:46:49] clean started ...
[09:46:49] clean finished in 3 ms
[09:46:49] copy started ...
[09:46:49] deeplinks started ...
[09:46:49] deeplinks finished in 82 ms
[09:46:49] transpile started ...
[09:46:53] transpile finished in 4.53 s
[09:46:53] preprocess started ...
[09:46:53] preprocess finished in 1 ms
[09:46:53] webpack started ...
[09:46:54] copy finished in 4.91 s
[09:47:02] webpack finished in 8.89 s
[09:47:02] sass started ...
Without `from` option PostCSS could generate wrong source map and will not find Browserslist config. Set it to CSS file path or to `undefined` to prevent this warning.
[09:47:04] sass finished in 1.88 s
[09:47:04] postprocess started ...
[09:47:04] postprocess finished in 9 ms
[09:47:04] lint started ...
[09:47:04] build dev finished in 15.53 s
[09:47:04] watch ready in 15.61 s
[09:47:04] dev server running: http://localhost:8100/
[OK] Development server running!
Local: http://localhost:8100
External: http://10.0.0.120:8100
> cordova run android --device
Android Studio project detected
ANDROID_HOME=/home/dre/android-sdk/tools
JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
studio
Subproject Path: CordovaLib
Subproject Path: app
FAILURE: Build failed with an exception.
* Where:
Script '/home/dre/workspace/nortech/pk-du-mobile/platforms/android/CordovaLib/cordova.gradle' line: 68
* What went wrong:
A problem occurred evaluating project ':CordovaLib'.
>
No installed build tools found. Install the Android build tools version 19.1.0 or higher.
* Try:
Run with
--stacktrace
option to get the stack trace. Run with --info or --debug option to get more log output.
* Get more help at https://help.gradle.org
BUILD FAILED in 0s
(node:4233) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: /home/dre/workspace/nortech/pk-du-mobile/platforms/android/gradlew: Command failed with exit code 1 Error output:
FAILURE: Build failed with an exception.
* Where:
Script '/home/dre/workspace/nortech/pk-du-mobile/platforms/android/CordovaLib/cordova.gradle' line: 68
* What went wrong:
A problem occurred evaluating project ':CordovaLib'.
> No installed build tools found. Install the Android build tools version 19.1.0 or higher.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
* Get more help at https://help.gradle.org
BUILD FAILED in 0s
please could someone help me figure out why this command can’t find the build tools?
