diff --git a/03-boottoolsSoftwareInstall.py b/03-boottoolsSoftwareInstall.py
index 6d0cefe..e93cabc 100755
--- a/03-boottoolsSoftwareInstall.py
+++ b/03-boottoolsSoftwareInstall.py
@@ -6,31 +6,13 @@ import sys
 import re
 import subprocess
 
-from boottoolsfunctions import utils
+from boottoolsfunctions import utils, apt
 
 config = utils.read_config ('boottoolsgenerator.cfg')
 if config is None:
     sys.exit (1)
 debconf_settings = config['General'].get ('debconf_settings')
 
-def _aptget_clean():
-    utils.run (['apt-get', '--yes', 'clean'])
-
-def _aptget_autoclean():
-    utils.run (['apt-get', '--yes', 'autoclean'])
-
-def _aptget_autoremove():
-    utils.run (['apt-get', '--yes', 'autoremove'])
-
-def _aptget_update():
-    utils.run (['apt-get', '--yes', 'update'])
-
-def _aptget_upgrade():
-    utils.run (['apt-get', '--yes', 'upgrade'])
-
-def _aptget_install (pkgs, opts=[]):
-    utils.run (['apt-get', '--yes'] + opts + ['install'] + pkgs)
-
 def _oghook_deactivate():
     #Desactivamos el hook del oginitrd.img para evitar problemas, al final de este escripts se activará
     os.rename ('/etc/initramfs-tools/hooks/oghooks', '/etc/initramfs-tools/oghooks')
@@ -60,29 +42,24 @@ def boottoolsSoftwareInstall (osarch, osrelease):
         utils.run (['dpkg-divert', '--local', '--rename', '--add', '/sbin/initctl'])
         os.symlink ('/bin/true', '/sbin/initctl')
 
-    _aptget_clean()
     pkgs32 = []
     if 'i386' != osarch:
         utils.run (['dpkg', '--add-architecture', 'i386'])
         pkgs32 = 'lib32gcc-s1 lib32stdc++6 lib32z1 libc6-i386'.split (' ')         ## he cambiado lib32gcc1 por lib32gcc-s1 pero como queramos crear un oglive viejo, esto va a petar
 
-    _aptget_update()           ## esto ya esta hecho...
     _oghook_deactivate()
-    _aptget_upgrade()
     #_mock_mtab()
 
-    _aptget_install ([f'linux-image-{osrelease}', f'linux-headers-{osrelease}', f'linux-modules-{osrelease}', f'linux-modules-extra-{osrelease}', 'dkms', 'shim-signed', 'openssl'])
+    apt.install ([f'linux-image-{osrelease}', f'linux-headers-{osrelease}', f'linux-modules-{osrelease}', f'linux-modules-extra-{osrelease}', 'dkms', 'shim-signed', 'openssl'])
 
     subprocess.run (['debconf-set-selections'], input=debconf_settings, text=True)
 
-    _aptget_install (['sshfs', 'kexec-tools'] + pkgs32, opts=['-o', 'DPkg::Options::=--force-confdef'])     ## hace falta --force-confdef para evitar un tema interactivo del /etc/ssh/ssh_config
+    apt.install (['sshfs', 'kexec-tools'] + pkgs32, opts={'DPkg::Options::': '--force-confdef'})     ## hace falta --force-confdef para evitar un tema interactivo del /etc/ssh/ssh_config
 
     pkgs = []
     for section in config.options('Packages'):
         pkgs += re.split (r'[ \n]', config['Packages'].get(section).strip())
-    print ('about to install these packages: "{}"'.format (' '.join (pkgs)))
-    ## TODO don't fail when there are unknown/uninstallable packages
-    _aptget_install (pkgs)
+    apt.install (pkgs)
 
     # Instalar módulos que algunos paquetes puedan tener pendientes de compilar.
     stdout, _ = utils.run (['dkms', 'status'])
@@ -96,9 +73,8 @@ def boottoolsSoftwareInstall (osarch, osrelease):
 
     _oghook_activate()
     #_restore_mtab()
-    _aptget_clean()
-    _aptget_autoclean()
-    _aptget_autoremove()
+    apt.clean()
+    apt.autoremove()
 
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
diff --git a/04-boottoolsSoftwareCompile.py b/04-boottoolsSoftwareCompile.py
index 484cde5..4456066 100755
--- a/04-boottoolsSoftwareCompile.py
+++ b/04-boottoolsSoftwareCompile.py
@@ -2,7 +2,7 @@
 
 import os
 import subprocess
-from boottoolsfunctions import utils
+from boottoolsfunctions import utils, apt
 
 os.environ['LANGUAGE'] = os.environ['LC_ALL'] = os.environ['LANG'] = 'C'
 os.chdir ('/tmp')
@@ -28,9 +28,9 @@ except:
 
 if not os.path.exists ('python-libfdisk'):
     print ('python-libfdisk')
-    utils.run (['apt-get', '-y', 'install', 'python3-psutil', 'python3-dev', 'libfdisk-dev', 'python3-setuptools'])
+    apt.install (['python3-psutil', 'python3-dev', 'libfdisk-dev', 'python3-setuptools'])
     utils.run (['git', 'clone', 'git://git.48k.eu/python-libfdisk'])
     os.chdir ('python-libfdisk')
     utils.run (['python3', 'setup.py', 'install'])
     os.chdir ('..')
-    utils.run (['apt-get', '-y', 'remove', 'python3-dev', 'python3-setuptools'])
+    apt.remove (['python3-dev', 'python3-setuptools'])
diff --git a/boottoolsgenerator.py b/boottoolsgenerator.py
index 03ddb78..dc443f9 100755
--- a/boottoolsgenerator.py
+++ b/boottoolsgenerator.py
@@ -10,7 +10,7 @@ import shutil
 
 curdir = os.path.dirname (__file__)
 sys.path.insert (0, curdir)
-from boottoolsfunctions import utils, btog
+from boottoolsfunctions import utils, apt, btog
 
 def _logging():
     #logging.root.handlers = []
@@ -41,17 +41,18 @@ def _mount_rootfs():
         logger.error ('mount failed')
         sys.exit (1)
 
+def _apt_update_upgrade():
+    apt.update()
+    apt.upgrade()
+
 def _get_pxepkg():
     #grep "http://free.nchc.org.tw/drbl-core" /etc/apt/sources.list || echo "deb http://free.nchc.org.tw/drbl-core drbl stable" >> /etc/apt/sources.list
-    utils.run (['apt-get', 'update'])
-    acse_gpxe, _ = utils.run (['apt-cache', 'search', 'gpxe'])
-    acse_ipxe, _ = utils.run (['apt-cache', 'search', 'ipxe'])
-    if acse_ipxe:
-        pxepkg = 'ipxe'
-    elif acse_gpxe:
-        pxepkg = 'gpxe'
-    else:
-        logger.error ('neither gpxe nor ipxe found in apt-cache')
+    pxepkg = None
+    cache = apt.cache_search (['gpxe', 'ipxe'])
+    if cache['gpxe']: pxepkg = 'gpxe'
+    if cache['ipxe']: pxepkg = 'ipxe'
+    if pxepkg is None:
+        logger.error ('neither gpxe nor ipxe found in apt cache')
         sys.exit (1)
     logger.info (f'PXE package is "{pxepkg}"')
     return pxepkg
@@ -185,6 +186,7 @@ try: utils.umount (btrootfsmnt)
 except: pass
 
 logger.info ('FASE 2 - Instalación de software adicional.')
+_apt_update_upgrade()
 pxepkg = _get_pxepkg()
 utils.run (['apt-get', '-y', 'install', 'jq', 'syslinux', 'syslinux-efi', 'syslinux-utils', 'debootstrap', 'subversion', 'schroot', 'squashfs-tools', 'syslinux', 'genisoimage', 'qemu-utils', 'lsof', pxepkg])    ## TODO qemu no existe, hace falta?