After updating qt 5.15.7, there's a problem on screen locking

[shenyao]

Error message is:

The screen locker is broken
…
loginctl unlock-session 2
…

It’s really similar to This topic. But this time is:

Cannot mix incompatible Qt library (5.15.6) with this library (5.15.7)

I refered to the old topic and tried to use this command to fix:

sudo pacman-mirrors -f 5 && sudo pacman -Syyu 

But it doesn’t work. Sad.

But after I went back to qt 5.15.6, the problem dispeared.

[Strit]

It seems that you still have a QT package at version 5.15.6 after updating.

So after updating, try running

pacman -Qs qt5 | grep 5.15.6

to see what packages still wasn’t updated.

[shenyao]

Yes, it seems there’s a package called

qt5-virtualkeyboard-bigscreen

not updated. I think that’s the problem.

[maycne.sonahoz]

@shenyao

Cannot mix incompatible Qt library (5.15.6) with this library (5.15.7)

[HowTo] Fix "Cannot mix incompatible Qt library"

Difficulty: ★☆☆☆☆ Where does the error come from? As the message suggests, the error comes from a difference in Qt library versions used for building and then running applications. qt5-styleplugins moved to AUR In Manjaro, this error started occurring “regularly” following the deprecation of qt5-styleplugins. That package was previously used, among other cases, for applying GTK2 style to Qt applications running in GTK environment (Gnome, Xfce…). Following the drop of GTK2 support upstream, …

[shenyao]

Thanks for the guide. I think I need to wait for the new qt5 package added to the unstable branch.

[shenyao]

After receiving the latest update, this problem is solved. Thank you.