Public bug reported:

Traceback (most recent call last):
  File "/usr/bin/qtqr", line 509, in saveCode
    if not fn.toLower().endsWith(u".png") \
AttributeError: 'tuple' object has no attribute 'toLower'
Abortado (`core' generado)


While saving a QR code with the following WiFi Network information:

SSID: EXAMPLE_SSID
PASSWORD: 714f15160af9de64ce5f2835b191c1e226418f01baa84011c1b1075201bdf2
Encryption: WPA/WPA2
Pixel size: 5
Protection level: Minimum/Lowest
Margin size: 6

I have tested with the version of QtQr in Kubuntu repositories and with the 
latest version from the daily PPA. The same crash is reported.
Additionally, QtQr writes a file every time I introduce a character of any of 
the fields of the WiFi network (SSID, PASSWORD, encryption). The directory 
where I launch QtQr from has the following files:

714f15160af9de64ce5f2835b191c1e226418f01baa84011c1b1075201bdf2.png  EXAMPLE.png 
      EXAMPLE_SSI.png  EXAM.png   EX.png
E.png                                                               
EXAMPLE_S.png     EXAMPLE_SS.png   EXAMP.png
EXAMPLE_.png                                                        
EXAMPLE_SSID.png  EXAMPL.png       EXA.png


I copied and pasted the password string, so maybe that is why it has
generated extra files.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: qtqr 1.4~bzr23-1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Oct 31 20:21:03 2017
InstallationDate: Installed on 2015-07-31 (823 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
SourcePackage: qr-tools
UpgradeStatus: Upgraded to artful on 2017-10-25 (6 days ago)

** Affects: qr-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful

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https://bugs.launchpad.net/bugs/1729066

Title:
  [Kubuntu 17.10 / PPA daily] QtQr crashes while saving to PNG

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