I had a look at your logs, they showed the following entries:

Aug  1 22:19:07 lubuntu in-target: Reading package lists...
Aug  1 22:19:08 lubuntu in-target: 
Aug  1 22:19:15 lubuntu in-target: Get:1 http://extras.ubuntu.com precise 
InRelease [1,938 B]
Aug  1 22:19:15 lubuntu in-target: Ign http://extras.ubuntu.com precise 
InRelease
Aug  1 22:19:15 lubuntu in-target: Get:2 http://extras.ubuntu.com precise/main 
Sources [1,938 B]
Aug  1 22:19:15 lubuntu in-target: bzip2: (stdin) is not a bzip2 file.
Aug  1 22:19:15 lubuntu in-target: Get:3 http://extras.ubuntu.com precise/main 
i386 Packages [1,938 B]
Aug  1 22:19:15 lubuntu in-target: bzip2: (stdin) is not a bzip2 file.
Aug  1 22:19:15 lubuntu in-target: Get:4 http://extras.ubuntu.com precise/main 
TranslationIndex [1,938 B]
Aug  1 22:19:16 lubuntu in-target: /usr/bin/xz: 
Aug  1 22:19:16 lubuntu in-target: (stdin): File format not recognized
Aug  1 22:19:16 lubuntu in-target: 
Aug  1 22:19:16 lubuntu in-target: Err http://extras.ubuntu.com precise/main 
Sources
Aug  1 22:19:16 lubuntu in-target:   
Aug  1 22:19:16 lubuntu in-target: /usr/bin/xz: 
Aug  1 22:19:16 lubuntu in-target: (stdin): File format not recognized
Aug  1 22:19:16 lubuntu in-target: 
Aug  1 22:19:16 lubuntu in-target: Err http://extras.ubuntu.com precise/main 
i386 Packages
Aug  1 22:19:16 lubuntu in-target:   
Aug  1 22:19:16 lubuntu in-target: /usr/bin/lzma: 
Aug  1 22:19:16 lubuntu in-target: (stdin): File format not recognized
Aug  1 22:19:16 lubuntu in-target: 
Aug  1 22:19:16 lubuntu in-target: /usr/bin/lzma: 
Aug  1 22:19:16 lubuntu in-target: (stdin): File format not recognized
Aug  1 22:19:16 lubuntu in-target: 
Aug  1 22:19:17 lubuntu in-target: Fetched 7,752 B in 6s (1,285 B/s)
Aug  1 22:19:17 lubuntu in-target: W
Aug  1 22:19:17 lubuntu in-target: : 
Aug  1 22:19:17 lubuntu in-target: GPG error: http://extras.ubuntu.com precise 
InRelease: File 
/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_precise_InRelease 
doesn't start with a clearsigned message
Aug  1 22:19:17 lubuntu in-target: 
Aug  1 22:19:17 lubuntu in-target: W
Aug  1 22:19:17 lubuntu in-target: : 
Aug  1 22:19:17 lubuntu in-target: Failed to fetch 
gzip:/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_precise_main_source_Sources
  Encountered a section with no Package: header
Aug  1 22:19:17 lubuntu in-target: 
Aug  1 22:19:17 lubuntu in-target: W
Aug  1 22:19:17 lubuntu in-target: : 
Aug  1 22:19:17 lubuntu in-target: Failed to fetch 
http://extras.ubuntu.com/ubuntu/dists/precise/main/i18n/Index  No Hash entry in 
Release file 
/var/lib/apt/lists/partial/extras.ubuntu.com_ubuntu_dists_precise_main_i18n_Index
Aug  1 22:19:17 lubuntu in-target: 
Aug  1 22:19:17 lubuntu in-target: E
Aug  1 22:19:17 lubuntu in-target: : 
Aug  1 22:19:17 lubuntu in-target: Some index files failed to download. They 
have been ignored, or old ones used instead.

That means you were connected to the Internet while installing Lubuntu:
the installer tried to fetch a list of the most recent packages to
install all updates and failed due to network issues.

Could you please reinstall again (before you install, make sure the
virtual network card is disconnected - right click on the network card
icon, click "Network cards" and deselect the "Cable connected" checkbox)
and tell me here how it went? (You can always update Ubuntu later).

** Changed in: ubiquity (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1031969

Title:
  OS installer crashed

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