title: Module not found (but is installed) in Ubuntu
body: <p>My script run successfully on original version of Ubuntu 10.10 after installing the <code>lxml</code> module. (python 2.6.6)</p>
  
  <p>So I've compiled and installed manually the pyhton2.7 (from the source code). My script did not worked anymore:</p>
  
  <pre><code>Error: ImportError: No module named lxml
  </code></pre>
  
  <p>I've returned to the python2.6.7 (from the source code), but the error keep happening. The right python version (2.6.7) is invoked.</p>
  
  <p><strong>Note:</strong> I removed and reinstalled the package <code>python-lxml</code> many times after the error. The error remains:</p>
  
  <pre><code>sudo aptitude install pyhton-lxml
  </code></pre>
  
  <p>Do I have to execute some kind of magical script to python finding the module?</p>
  
  <p>Bellow is the output of the command: <code>strace ./RunScriptPython.py</code> (with <code>python -v</code>)</p>
  
  <pre><code>$ strace ./RunScriptPython.sh 
  execve("./RunScriptPython.sh", ["./RunScriptPython.sh"], [/* 38 vars */]) = 0
  brk(0)                                  = 0x9be3000
  access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
  mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb770c000
  access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
  open("/etc/ld.so.cache", O_RDONLY)      = 3
  fstat64(3, {st_mode=S_IFREG|0644, st_size=81621, ...}) = 0
  mmap2(NULL, 81621, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb76f8000
  close(3)                                = 0
  access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
  open("/lib/libc.so.6", O_RDONLY)        = 3
  read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0@n\1\0004\0\0\0"..., 512) = 512
  fstat64(3, {st_mode=S_IFREG|0755, st_size=1421892, ...}) = 0
  mmap2(NULL, 1427880, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x1d7000
  mmap2(0x32e000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x157) = 0x32e000
  mmap2(0x331000, 10664, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x331000
  close(3)                                = 0
  mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb76f7000
  set_thread_area({entry_number:-1 -&gt; 6, base_addr:0xb76f78d0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
  mprotect(0x32e000, 8192, PROT_READ)     = 0
  mprotect(0x805c000, 4096, PROT_READ)    = 0
  mprotect(0xf33000, 4096, PROT_READ)     = 0
  munmap(0xb76f8000, 81621)               = 0
  getpid()                                = 3006
  rt_sigaction(SIGCHLD, {SIG_DFL, [CHLD], SA_RESTART}, {SIG_DFL, [], 0}, 8) = 0
  geteuid32()                             = 905975433
  brk(0)                                  = 0x9be3000
  brk(0x9c04000)                          = 0x9c04000
  getppid()                               = 3005
  stat64("/home/CEDROFINANCES/alexander.miro/dev/cedro/20120113_8P_Correcoes_linux/tools/bean_maker", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
  stat64(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
  open("./RunScriptPython.sh", O_RDONLY)  = 3
  fcntl64(3, F_DUPFD, 10)                 = 10
  close(3)                                = 0
  fcntl64(10, F_SETFD, FD_CLOEXEC)        = 0
  rt_sigaction(SIGINT, NULL, {SIG_DFL, [], 0}, 8) = 0
  rt_sigaction(SIGINT, {0x8056690, ~[RTMIN RT_1], 0}, NULL, 8) = 0
  rt_sigaction(SIGQUIT, NULL, {SIG_DFL, [], 0}, 8) = 0
  rt_sigaction(SIGQUIT, {SIG_DFL, ~[RTMIN RT_1], 0}, NULL, 8) = 0
  rt_sigaction(SIGTERM, NULL, {SIG_DFL, [], 0}, 8) = 0
  rt_sigaction(SIGTERM, {SIG_DFL, ~[RTMIN RT_1], 0}, NULL, 8) = 0
  read(10, "#!/bin/sh\nrm -rf ../../broker_co"..., 8192) = 325
  open("../../broker_communication/beans", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 3
  fcntl64(3, F_GETFD)                     = 0x1 (flags FD_CLOEXEC)
  getdents(3, /* 3 entries */, 32768)     = 48
  getdents(3, /* 0 entries */, 32768)     = 0
  close(3)                                = 0
  stat64("/usr/local/sbin/rm", 0xbf926940) = -1 ENOENT (No such file or directory)
  stat64("/usr/local/bin/rm", 0xbf926940) = -1 ENOENT (No such file or directory)
  stat64("/usr/sbin/rm", 0xbf926940)      = -1 ENOENT (No such file or directory)
  stat64("/usr/bin/rm", 0xbf926940)       = -1 ENOENT (No such file or directory)
  stat64("/sbin/rm", 0xbf926940)          = -1 ENOENT (No such file or directory)
  stat64("/bin/rm", {st_mode=S_IFREG|0755, st_size=46756, ...}) = 0
  clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb76f7938) = 3007
  wait4(-1, [{WIFEXITED(s) &amp;&amp; WEXITSTATUS(s) == 0}], 0, NULL) = 3007
  --- SIGCHLD (Child exited) @ 0 (0) ---
  open("../../broker_communication/fix_translation", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 3
  getdents(3, /* 3 entries */, 32768)     = 48
  getdents(3, /* 0 entries */, 32768)     = 0
  close(3)                                = 0
  clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb76f7938) = 3008
  wait4(-1, [{WIFEXITED(s) &amp;&amp; WEXITSTATUS(s) == 0}], 0, NULL) = 3008
  --- SIGCHLD (Child exited) @ 0 (0) ---
  stat64("/usr/local/sbin/python", 0xbf926940) = -1 ENOENT (No such file or directory)
  stat64("/usr/local/bin/python", {st_mode=S_IFREG|0755, st_size=4081553, ...}) = 0
  clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb76f7938) = 3009
  wait4(-1, # installing zipimport hook
  import zipimport # builtin
  # installed zipimport hook
  # /usr/local/lib/python2.6/site.pyc matches /usr/local/lib/python2.6/site.py
  import site # precompiled from /usr/local/lib/python2.6/site.pyc
  # /usr/local/lib/python2.6/os.pyc matches /usr/local/lib/python2.6/os.py
  import os # precompiled from /usr/local/lib/python2.6/os.pyc
  import errno # builtin
  import posix # builtin
  # /usr/local/lib/python2.6/posixpath.pyc matches /usr/local/lib/python2.6/posixpath.py
  import posixpath # precompiled from /usr/local/lib/python2.6/posixpath.pyc
  # /usr/local/lib/python2.6/stat.pyc matches /usr/local/lib/python2.6/stat.py
  import stat # precompiled from /usr/local/lib/python2.6/stat.pyc
  # /usr/local/lib/python2.6/genericpath.pyc matches /usr/local/lib/python2.6/genericpath.py
  import genericpath # precompiled from /usr/local/lib/python2.6/genericpath.pyc
  # /usr/local/lib/python2.6/warnings.pyc matches /usr/local/lib/python2.6/warnings.py
  import warnings # precompiled from /usr/local/lib/python2.6/warnings.pyc
  # /usr/local/lib/python2.6/linecache.pyc matches /usr/local/lib/python2.6/linecache.py
  import linecache # precompiled from /usr/local/lib/python2.6/linecache.pyc
  # /usr/local/lib/python2.6/types.pyc matches /usr/local/lib/python2.6/types.py
  import types # precompiled from /usr/local/lib/python2.6/types.pyc
  # /usr/local/lib/python2.6/UserDict.pyc matches /usr/local/lib/python2.6/UserDict.py
  import UserDict # precompiled from /usr/local/lib/python2.6/UserDict.pyc
  # /usr/local/lib/python2.6/_abcoll.pyc matches /usr/local/lib/python2.6/_abcoll.py
  import _abcoll # precompiled from /usr/local/lib/python2.6/_abcoll.pyc
  # /usr/local/lib/python2.6/abc.pyc matches /usr/local/lib/python2.6/abc.py
  import abc # precompiled from /usr/local/lib/python2.6/abc.pyc
  # /usr/local/lib/python2.6/copy_reg.pyc matches /usr/local/lib/python2.6/copy_reg.py
  import copy_reg # precompiled from /usr/local/lib/python2.6/copy_reg.pyc
  import encodings # directory /usr/local/lib/python2.6/encodings
  # /usr/local/lib/python2.6/encodings/__init__.pyc matches /usr/local/lib/python2.6/encodings/__init__.py
  import encodings # precompiled from /usr/local/lib/python2.6/encodings/__init__.pyc
  # /usr/local/lib/python2.6/codecs.pyc matches /usr/local/lib/python2.6/codecs.py
  import codecs # precompiled from /usr/local/lib/python2.6/codecs.pyc
  import _codecs # builtin
  # /usr/local/lib/python2.6/encodings/aliases.pyc matches /usr/local/lib/python2.6/encodings/aliases.py
  import encodings.aliases # precompiled from /usr/local/lib/python2.6/encodings/aliases.pyc
  # /usr/local/lib/python2.6/encodings/utf_8.pyc matches /usr/local/lib/python2.6/encodings/utf_8.py
  import encodings.utf_8 # precompiled from /usr/local/lib/python2.6/encodings/utf_8.pyc
  Python 2.6.7 (r267:88850, Jan 30 2012, 14:30:06) 
  [GCC 4.4.5] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  Traceback (most recent call last):
    File "bean_maker.py", line 1, in &lt;module&gt;
      from lxml import etree
  ImportError: No module named lxml
  # clear __builtin__._
  # clear sys.path
  # clear sys.argv
  # clear sys.ps1
  # clear sys.ps2
  # clear sys.exitfunc
  # clear sys.exc_type
  # clear sys.exc_value
  # clear sys.exc_traceback
  # clear sys.last_type
  # clear sys.last_value
  # clear sys.last_traceback
  # clear sys.path_hooks
  # clear sys.path_importer_cache
  # clear sys.meta_path
  # clear sys.flags
  # clear sys.float_info
  # restore sys.stdin
  # restore sys.stdout
  # restore sys.stderr
  # cleanup __main__
  # cleanup[1] encodings
  # cleanup[1] site
  # cleanup[1] abc
  # cleanup[1] _codecs
  # cleanup[1] _warnings
  # cleanup[1] zipimport
  # cleanup[1] encodings.utf_8
  # cleanup[1] codecs
  # cleanup[1] signal
  # cleanup[1] posix
  # cleanup[1] encodings.aliases
  # cleanup[1] exceptions
  # cleanup[2] copy_reg
  # cleanup[2] posixpath
  # cleanup[2] errno
  # cleanup[2] _abcoll
  # cleanup[2] types
  # cleanup[2] genericpath
  # cleanup[2] stat
  # cleanup[2] warnings
  # cleanup[2] UserDict
  # cleanup[2] os.path
  # cleanup[2] linecache
  # cleanup[2] os
  # cleanup sys
  # cleanup __builtin__
  # cleanup ints: 18 unfreed ints
  # cleanup floats
  [{WIFEXITED(s) &amp;&amp; WEXITSTATUS(s) == 1}], 0, NULL) = 3009
  --- SIGCHLD (Child exited) @ 0 (0) ---
  read(10, "", 8192)                      = 0
  exit_group(1)                           = ?
  </code></pre>