help > QT error in ubuntu 20.04: undefined symbol
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Apr 22, 2021  03:04 AM | Christopher Adamson
QT error in ubuntu 20.04: undefined symbol
In Ubuntu 20.04 I run MRIcroGL_QT and get the following error:

./MRIcroGL_QT: symbol lookup error: ./MRIcroGL_QT: undefined symbol: QLCLOpenGLWidget_Create

Any suggestions?

Thank you.
Apr 22, 2021  11:04 AM | Chris Rorden
RE: QT error in ubuntu 20.04: undefined symbol
I also run MRIcroGL for QT on Ubuntu 20.04. Can you try out these solutions:

a. Run these commands

sudo apt-get update
sudo apt install libqt5pas1

b. If this fails to resolve your problem:


wget -O- http://neuro.debian.net/lists/bionic.us-... | sudo tee /etc/apt/sources.list.d/neurodebian.sources.list
sudo apt-key adv --recv-keys --keyserver hkp://pool.sks-keyservers.net:80 0xA5D32F012649A5A9
sudo apt-get update
sudo apt install libqt5pas1

These are described in the text file MRIcroGL_Linux_Installation.txt that comes with MRIcroGL
Apr 22, 2021  11:04 PM | Christopher Adamson
RE: QT error in ubuntu 20.04: undefined symbol
I tried these in 20.04 and 18.04 and they didn't work.
Originally posted by Chris Rorden:
I also run MRIcroGL for QT on Ubuntu 20.04. Can you try out these solutions:

a. Run these commands

sudo apt-get update
sudo apt install libqt5pas1

b. If this fails to resolve your problem:


wget -O- http://neuro.debian.net/lists/bionic.us-... | sudo tee /etc/apt/sources.list.d/neurodebian.sources.list
sudo apt-key adv --recv-keys --keyserver hkp://pool.sks-keyservers.net:80 0xA5D32F012649A5A9
sudo apt-get update
sudo apt install libqt5pas1

These are described in the text file MRIcroGL_Linux_Installation.txt that comes with MRIcroGL
Apr 22, 2021  11:04 PM | Christopher Adamson
RE: QT error in ubuntu 20.04: undefined symbol
The libqt5pas library here worked.

https://github.com/davidbannon/libqt5pas...