I downloaded lubuntu-14.04.1-desktop-i386.iso. The calculated md5sum is: 281fc36d625f7ca0704297b3b811fa66 . According to help.ubuntu.com/community/UbuntuHashes that is the correct md5sum. Also according to cdimage.ubuntu.com/lubuntu/releases/14.04.1/release/lubuntu-14.04.1-desktop-i386.metalink that is the correct md5sum. But wubi downloads instead .../14.04/release/lubuntu-14.04-desktop-i386.metalink, that is the 14.04 version with a different md5sum

Here is the wubi.log showing this:

09-12 12:01 INFO   Distro: Found a valid iso for Lubuntu: F:\lubuntu-14.04.1->desktop-i386.iso
09-12 12:01 DEBUG  TaskList: New task get_metalink
09-12 12:01 DEBUG  TaskList: #### Running get_metalink...
09-12 12:01 DEBUG  downloader: downloading .../lubuntu/releases/14.04/release/lubuntu-**14.04**-desktop-i386.metalink > C:\ubuntu\install
09-12 12:01 DEBUG  downloader: download finished (read 1043 bytes)

09-12 12:01 ERROR  CommonBackend: The md5 of the metalink does match
09-12 12:01 ERROR  CommonBackend: Cannot authenticate the metalink file, it might be corrupt
09-12 12:01 DEBUG  TaskList: #### Finished get_metalink
09-12 12:01 DEBUG  TaskList: New task get_file_md5
09-12 12:01 DEBUG  TaskList: #### Running get_file_md5...
09-12 12:02 DEBUG  TaskList: #### Finished get_file_md5
09-12 12:02 ERROR  CommonBackend: Invalid md5 for ISO F:\lubuntu-14.04.1-desktop->i386.iso (b0d1c58c8515ab40382d01f59655ba85 != 281fc36d625f7ca0704297b3b811fa66)

How do I solve this?

  • Well, you could try planting the 14.04 image there before running Wubi. – muru Sep 12 '14 at 12:29
  • possible duplicate of Ubuntu Wubi install is freezing / stalling / hanging on iso download (You can run wubi.exe with the --skipmd5check flag.) – Eliah Kagan Sep 12 '14 at 12:58
  • Instead of 'planting the 14.04 image before' I could also wubi let it download, but unfortunately that takes 29 hours. – Markus Sep 12 '14 at 14:43
  • But using --skipmd5check works, but actually wubi shouldn't compare the md5sum of the 14.04.1 file with the md5sum published for the 14.04 file in the first place. – Markus Sep 12 '14 at 14:51

Eliah Kagan's solution works fine. A bit more detail for real beginners:

  1. Copy Wubi to the hard disk from the CD. If you do not do it, Wubi just launches the CD install.

  2. Open a command window:

    Option A

    • Go to the Windows Start button, click and write cmd + Enter.
    • Then you need to change directory to the one containing wubi.exe.

    Option B

    • Open an explorer window and navigate to the folder containing wubi.exe.
    • Then press Shift and right-click the folder icon.
    • From the popup menu, select Open window command window here.
  3. Execute wubi disabling MD5 check. Write wubi --skipmd5check.

Follow the on-screen instructions to install a Wubi system.

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