Sencha SDK Tools for Linux x64 isn't for Linux x64 - jsdb is 32-bit application.
jsdb: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.8, stripped
Sencha SDK Tools includes binaries of (modified?) Qt - this isn't good. This causes segmentation fault on my Archlinux x64 and I think on many other platforms (removing directories "lib" and "imageformats", i.e. using instead system libraries, may resolve this problem). I think it's better to do in linux-way: provide sources, dependency list and build instructions instead of installer in windows-way. As example you can provide package for some distro (e.g. .deb for Ubuntu).
As for me, "sencha create jsb -a index.html -p app.jsb3 && sencha build -p app.jsb3 -d ." prints "Done building!" but generates an empty app-all.js (only with copyright notice), because paths in generated app.jsb3 contain too many "../../../../../../" - I have to fix this manualy in editor (or write my own build system).
Also Sencha SDK Tools violates license at least of jsdb. Quote from jsdb license:
2. Commercial software that includes JSDB, in source or binary form, must include this license
file or reference the JSDB.ORG web site in the documentation accompanying the product.
Sencha SDK Tools distribution doesn't contain anything of this except of jsdb executable file.
Quote from Sencha SDK Tools license:
"Copyright (c) 2011 Sencha Inc. All rights reserved."
This is incorrect, because jsdb license says:
"The origin of this software must not be misrepresented; you must not claim that you wrote the original software."
P.S. Why does "Sencha SDK Tools" exist only in 3.x forums?