Bug 20466

При переходе от бранча 4.1 к бранчу 5.0 (apt-get dist-upgrade) qtiplot запускается, но при наборе в две колонке цифр, их выделении и кликаньем по иконке "Plot as symbol" программа завершает работу. 

При запуске через gdb имеем:
$ gdb qtiplot
GNU gdb 6.6-alt3 (ALT Linux)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i586-alt-linux"...
(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(gdb) start
Function "main" not defined.
Make breakpoint pending on future shared library load? (y or [n])
Starting program: /usr/bin/qtiplot
(no debugging symbols found)
(no debugging symbols found)
/usr/bin/qtiplot: Symbol `_ZTV9QwtSymbol' has different size in shared object, consider re-linking
/usr/bin/qtiplot: Symbol `_ZTV13QwtPlotPicker' has different size in shared object, consider re-linking
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New process 10861]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
---Type <return> to continue, or q <return> to quit---
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[New Thread -1234643152 (LWP 10861)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1234643152 (LWP 10861)]
0xb7ec3a4c in QwtPlotGrid::enableY () from /usr/lib/libqwt.so.5
(gdb) kill

настараживают строки (см. выше)
"...
/usr/bin/qtiplot: Symbol `_ZTV9QwtSymbol' has different size in shared object, consider re-linking
/usr/bin/qtiplot: Symbol `_ZTV13QwtPlotPicker' has different size in shared object, consider re-linking
..."

похоже что переезд на новую версию библиотеки libqwt-5.1.1-alt1 вызвал сбои в работе программы. Ее явно надо пересобрать и слинковать с новой версией. И возможно принудительно прописать зависимости в спек.