Monero-gui: Can't launch v0.12.0.0 on Ubuntu

[1337tester]

GUI_VERSION = "v0.12.0.0"
Ubunutu - 17.10

When opening monero-wallet-gui, this error occurs (and the GUI is ofc not launched)
"
_QQmlApplicationEngine failed to load component
qrc:///main.qml:1043 Type StandardDialog unavailable
qrc:///components/StandardDialog.qml:30 module "QtQuick.Controls" version 2.0 is not installed
Error: no root objects_
"
Could be that this #1240 is causing it, after some research (aka quick duckduckgo search) - the issue can be that Ubuntu has also a older version of QT(5.0.2) which is first found when the program is launched - and it fails (even when the correct version is present in the system)

Don't know a easy way to fix this, probably there is a workaround, but I assume we don't really want people to remove some parts of ubuntu for installing a monero-gui build

[pazos]

From reddit/r/monero

sudo apt qml-module-qtquick-controls2

For ubuntu 17.10

[cdiv1e12]

Must also be Qt 5.7+

[1337tester]

thanks alot, worked, the command is btw:

sudo apt install qml-module-qtquick-controls2

Creating a PR for updating this new dependency in README.md

[ghost]

For Ubuntu 16.04LTS, this doesn't work:

sudo apt-get install qml-module-qtquick-controls2

As @skftn commented, the version must be higher, but that one is not available. You have to manually install it.

[1337tester]

can be closed

[cdiv1e12]

+resolved