"Startup Disk Creator" fails to launch with error "No module named 'sip'"

[Sai Vinoba]

Release: Kubuntu 21.04 daily build (20210416 iso), also affects Lubuntu and possibly Ubuntu Studio.

Software, version: usb-creator-kde, 0.3.9

How to reproduce:
1. Login to Kubuntu or Lubuntu hirsute daily build live-session (tested on 20210416 iso)
2. Click on 'Startup Disk Creator'

Expected:
The program launches normally.

Actual:
The program fails to launch.

If we try to launch the program from command line, we get following error.
```
Traceback (most recent call last):
  File "/usr/bin/usb-creator-kde", line 21, in <module>
    import sip
ModuleNotFoundError: No module named 'sip'
```

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: usb-creator-kde 0.3.9
ProcVersionSignature: Ubuntu 5.11.0-14.15-generic 5.11.12
Uname: Linux 5.11.0-14-generic x86_64
ApportVersion: 2.20.11-0ubuntu65
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.461
CurrentDesktop: KDE
Date: Sat Apr 17 08:00:16 2021
LiveMediaBuild: Kubuntu 21.04 "Hirsute Hippo" - Beta amd64 (20210416)
PackageArchitecture: all
SourcePackage: usb-creator
UpgradeStatus: No upgrade log present (probably fresh install)