![]() I saved them in a backup directory when I was figuring this out. Note, this is one of the files that needed to be deleted for any Qt5 app to successfully boot. I can't say I fully understand but it looks like its still linked into use by the system. How are they just reappearing? What could trigger this behavior? $ ldd -v libQt5Concurrent.so.5 Where is Qt supposed to be installing these libraries normally?Īre there supposed to be any of these files in /usr/local/lib/ ? Its not just one app being effected, its seemingly anything that is based on Qt5 - None of these are things I've written myself, I'm just a user. That means it probably wasn't tested for potential conflicts with official Ubuntu I agree there appears to be a conflict, although I don't know how to sort it out. If something is in /usr/local/ then it probably wasn't installed via the official Ubuntu channels. You can see which version is being loaded by using ldd. But the gist is this: You make somehow make sure that your app loads the correct version all the time. I don't have details on your app or how you installed Qt, so I can only give general info. When you deleted the wrong version, the app can no longer load the wrong version so it ended up loading the right version and ran fine. Your app loaded the wrong version so it couldn't run. ![]() In a nutshell: You have/had multiple versions of Qt in your system. There is also this directory within /usr/local/lib/ python3.8Īny help would be greatly said in Libraries must be deleted for Qt5 apps to work on Ubuntu 20.04: These are the libraries that seem to work correctly: libmpg123.so.0 This somehow causes the libraries to be recreated and that is the problem. Essentially, everything is working until installing a new app. This issue is somehow related to installing apps from Ubuntu Software app but I recently installed via apt ppa and that seemed to recreate the listed libraries as well. so.5 libs then Qt5 apps once again will open. Like a total fool, I didn't save the error but I believe it was "Undefined symbol" for each of the files in that list.īasically, if I $ sudo rm all those. When attempting to open a Qt5 app from CLI, i see there are issues with the followings files: /usr/local/lib/libQt5Xml.so.5 Qt5 based apps refuse to open from the GUI. I'm an end user (NOT a Qt Programmer) on Ubuntu 20.04LTS and I'm having the strangest issue.
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