...
[2015-07-17 18:02:13] [pac] DEBUG: sha256sum: aad3c340167949e967ee5526399feb732fd7dad9e9e17b77fdbc8e114155f949
[2015-07-17 18:02:13] [pac] DEBUG: checking sha256sum for /install/var/cache/pacman/pkg/usbutils-008-1-x86_64.pkg.tar.xz
[2015-07-17 18:02:13] [pac] ERROR: returning error 33 from check_validity : invalid or corrupted package
[2015-07-17 18:02:13] [pac] ERROR: Can't finalize alpm transaction: transaction failed, pm_errno 33 (invalid or corrupted package), []
[2015-07-17 18:02:13] [pac] DEBUG: Releasing alpm transaction...
[2015-07-17 18:02:13] [pac] DEBUG: Alpm transaction done.
[2015-07-17 18:02:13] [process] ERROR: "Can't install necessary packages. Cnchi can't continue."
[2015-07-17 18:02:13] [process] ERROR: Traceback (most recent call last):

[2015-07-17 18:02:13] [process] ERROR:   File "/usr/share/cnchi/cnchi/installation/process.py", line 166, in run
    self.run_installation()

[2015-07-17 18:02:13] [process] ERROR:   File "/usr/share/cnchi/cnchi/misc/misc.py", line 175, in helper
    return func(*args, **kwargs)

[2015-07-17 18:02:13] [process] ERROR:   File "/usr/share/cnchi/cnchi/installation/process.py", line 362, in run_installation
    self.install_packages()

[2015-07-17 18:02:13] [process] ERROR:   File "/usr/share/cnchi/cnchi/installation/process.py", line 724, in install_packages
    raise InstallError(txt)

[2015-07-17 18:02:13] [process] ERROR: misc.misc.InstallError: "Can't install necessary packages. Cnchi can't continue."

[2015-07-17 18:02:13] [show_message] ERROR: "Can't install necessary packages. Cnchi can't continue."