Почему зависает PyQt5 в Ubuntu 14.04?

Question

[Alex F]

Приветствую всех.
Есть несколько прог собственного изготовления на PyQt5. Под было gentoo все прекрасно, но сломался комп и вынужден бул пересесть на машину жены, где ubuntu 14.04. Поставил все модули и... И не работает ни одна моя прога.

PyQt5

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import re
import sys
import warnings
import os
import lxml.etree as et
from PyQt5 import (QtCore, QtGui, uic, QtWidgets)
from PyQt5.QtWidgets import (QMainWindow, QTextEdit, QAction, QFileDialog, QApplication, QProgressBar)
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import *

warnings.filterwarnings("ignore")
cwd = os.path.expanduser('~')

filename = 'converter.ui'
filename = cwd + "/codding/Convert-fb2/" + filename
Form, Base = uic.loadUiType(filename)

class MyWindow(QtWidgets.QWidget, Form):
    def __init__(self, parent=None):
        QtWidgets.QWidget.__init__(self, parent)
        self.ui = Form()
        self.ui.setupUi(self)
        self.timer = QBasicTimer()
        self.step = 0
        self.ui.btnQuit.clicked.connect(QCoreApplication.instance().quit)
        self.ui.showd.clicked.connect(self.getfiles)
        self.ui.btnConv.clicked.connect(self.convertfiles)
        
    def getfiles(self):

        fname = QFileDialog.getOpenFileName(self, "Open fb2", "/home/", "FictionBook Files (*.fb2)")[0]
        if fname == '':
            QFileDialog(self, quit())
       
        with open(fname, 'r') as data:
            data = data.read()
            self.ui.textIn.setText(data)
            self.ui.mylabel.setText('Input file: ' + fname)
        global fout
        fout = re.sub(r'\.fb2', '', fname)
        fout = fout + '.txt'

        with open(fname, 'rb') as f_in, open(fout, 'w') as f_out:
            check = f_in.read()
            tree = et.fromstring(check)
            ns = {'ns': "http://www.gribuser.ru/xml/fictionbook/2.0"}
            for bin_eb in tree.xpath('//ns:binary', namespaces=ns):
                bin_eb.getparent().remove(bin_eb)
            for bin_ed in tree.xpath('//ns:description', namespaces=ns):
                bin_ed.getparent().remove(bin_ed)
            global cleart, cleart2
            cleart = et.tounicode(tree)
            cleart = re.sub(r'\<[^>]*\>', '', cleart)

            self.ui.textOut.setText(cleart)

    def convertfiles(self):
        if self.ui.textOut.toPlainText() == '' or self.ui.textIn.toPlainText() == '':
            self.ui.textOut.setText('ОТКРОЙ ФАЙЛ!')
        else:
            cleart2 = self.ui.textOut.toPlainText()
            self.ui.mylabel.setText('')
            with open(fout, 'w') as f_out:
                f_out.write(cleart2)
                self.ui.mylabel.setText('Saved file: ' + fout)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    window = MyWindow()
    window.setWindowTitle("Ковертер Fb2 > Txt")
    window.setWindowIcon(
        QtGui.QIcon(cwd + "/codding/Convert-fb2/" + 'icon.png'))
    window.show()
    sys.exit(app.exec_())

Зависает наглухо.
Выхлоп здесь

А вот PyQt4 прекрасно работает

Код на PyQt4

#!/usr/bin/env python3.4
# -*- coding: utf-8 -*-

import re
import sys
import warnings
import lxml.etree as et
from PyQt4 import (QtCore, QtGui, uic)
from PyQt4.QtGui import QIcon
from PyQt4.QtGui import QFileDialog
from PyQt4.QtCore import *

warnings.filterwarnings("ignore")

Form, Base = uic.loadUiType("/home/fil/codding/Convert-fb2/converter.ui")

class MyWindow(QtGui.QWidget, Form):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.ui = Form()
        self.ui.setupUi(self)
        self.timer = QBasicTimer()
        self.step = 0
        self.ui.btnQuit.clicked.connect(QCoreApplication.instance().quit)
        self.ui.showd.clicked.connect(self.getfiles)
        self.ui.btnConv.clicked.connect(self.convertfiles)
        self.setGeometry(400, 200, 1000, 420)

    def getfiles(self):

        fname = QtGui.QFileDialog.getOpenFileName(self, "Open fb2", "/home/fil/", "FictionBook Files (*.fb2)")
        print (fname)

        with open(fname, 'r') as data:
            data = data.read()
            self.ui.textIn.setText(data)
            self.ui.mylabel.setText('Input file: ' + fname)

        global fout
        fout = re.sub(r'\.fb2', '', fname)
        fout = fout + '.txt'

        with open(fname, 'rb') as f_in, open(fout, 'w') as f_out:
            check = f_in.read()
            tree = et.fromstring(check)
            ns = {'ns': "http://www.gribuser.ru/xml/fictionbook/2.0"}
            for bin_eb in tree.xpath('//ns:binary', namespaces=ns):
                bin_eb.getparent().remove(bin_eb)
            for bin_ed in tree.xpath('//ns:description', namespaces=ns):
                bin_ed.getparent().remove(bin_ed)
            global cleart, cleart2
            cleart = et.tounicode(tree)
            cleart = re.sub(r'\<[^>]*\>', '', cleart)
            self.ui.textOut.setText(cleart)

    def convertfiles(self):
        cleart2 = self.ui.textOut.toPlainText()
        self.ui.mylabel.setText('')
        with open(fout, 'w') as f_out:
            f_out.write(cleart2)
        self.ui.mylabel.setText('Saved file: ' + fout)
        print(fout)

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    window = MyWindow()
    window.setWindowTitle("Ковертер Fb2 > Txt")
    window.setWindowIcon(
        QtGui.QIcon('skull.png'))
    window.show()
    sys.exit(app.exec_())

Как победить?
Спасибо.