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Ubuntu 22.04 support, segfault troubleshooting #263

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Ubuntu 22.04 support, segfault troubleshooting #263

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23 changes: 23 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,12 @@ To build / run on Ubuntu
sudo apt-get install -y qt5-default qtdeclarative5-dev qml-module-qtquick-dialogs qml-module-qt-labs-settings qml-module-qt-labs-folderlistmodel qml-module-qtqml-models2 qml-module-qtquick-controls
```

In Ubuntu 22.04, `qt5-default` is replaced by `qtbase5-dev`:

```bash
sudo apt-get install -y qtbase5-dev qt5-qmake
```

* Make a new folder, clone the pixelpulse library into it from git, and build it!

```bash
Expand All @@ -99,3 +105,20 @@ To build / run on Ubuntu
```bash
./pixelpulse2
```

#### Troubleshooting

If you encounter a segmentation fault launching Pixelpulse2 on Linux, make sure Qt5 is picked correctly. You may find GDB useful: run `gdb pixelpulse2` in a terminal to see what is causing the error. For example, the output below shows that conda's libQt5Qml.so is picked instead of Qt5 system package:

```
Thread 4 "QQmlThread" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff15fd640 (LWP 65006)]
0x00007ffff6fa01b8 in QQmlPropertyCache::property(int) const () from /home/.../miniconda3/lib/libQt5Qml.so.5
```

In this case, remove all Qt-related conda's packages:

```
$ conda remove pyqt pyqt5-sip qt-main qt-webengine qtwebkit
```