1. spooksmcgee's Avatar
    I just got a certified like new android and I'm trying to manually download and reinstall all my old apps. Two of them - Angry Birds Lite and full version of Labyrinth, will download just fine, but I get an "Installation unsuccessful" message when it tries to install. I've tried several times. I am not rooted. I went onto my SD card and removed the .com files (I don't remember the full name of the file) but it still won't let me install. Anyone know what could be wrong?

    Edit: Fixed it by removing the SD card to install it. Guess something there was still conflicting with it. Thanks.
    10-14-2010 02:51 PM
  2. rem_kujawa's Avatar
    Great find, I have found that clearing the data and cache in the market place app fixes most bugs too.
    10-14-2010 05:49 PM
  3. DWEB EVO's Avatar
    I just can't seem to figure out why Angry Birds won't download. It always says after installing that there was an unknown error -18. Even tried to download it off of getjar and it just says not installed at the end.

    Any ideas?
    10-18-2010 09:51 PM
  4. Cory Streater's Avatar
    DWEB: It's in the Market now. Is that where you are getting it from?
    10-18-2010 10:46 PM
  5. DWEB EVO's Avatar
    Yeah that was where I originally started. Everytime I try to download from there when it gets to 100% it says Unknown Error - 18 and then it disappears....

    Someone said try getjar and once I clicked on install it says right away installation unsuccessful. Not sure what's wrong....
    10-18-2010 11:05 PM
  6. azjerry's Avatar
    Lately when I get Installation Unsuccessful it's because the app is on the SD card. I manually move the app back to the phone, let it update and then manually move it back to the card. It's a pain.

    But I've also noticed than not all apps on the card have a problem updating. Some work just fine.
    10-19-2010 08:51 AM
  7. phillysdon04's Avatar
    Thanks

    Lately when I get Installation Unsuccessful it's because the app is on the SD card. I manually move the app back to the phone, let it update and then manually move it back to the card. It's a pain.

    But I've also noticed than not all apps on the card have a problem updating. Some work just fine.
    11-26-2010 07:10 PM
  8. anthonyzul's Avatar
    I've been getting this lately too.

    I am rooted, and after flashing a new ROM, I went to get all my apps back. The only 2 that I want back and can't get are Angry Birds and Blogaway. I get the Unknown Error -18 every time. I've wiped the data on the whole damn phone and I still get this error, and can not download them to save my life! I can't figure it out.
    12-06-2010 02:10 PM
  9. Roach's Avatar
    Try opening up google Talk and making sure it is logged in. There was a bug where the market and talk shared the same login, if one was logged out the other would stop working.
    12-08-2010 03:16 AM
  10. androidcheckstand's Avatar
    02-15-2011 06:56 PM
  11. Dnelson_1971's Avatar
    I do what AZJerry does in that I have to move the app back to the Phone from the SD card, then after it updates, move it back to the SD card. There has to be a cause for this. I have a stock HTC EVO 4G. Is this effecting Froyo phone?
    03-08-2011 07:11 PM
  12. shijobaby's Avatar
    06-24-2011 03:54 AM
  13. CmHall9's Avatar
    After doing some research I figured out how to get around the problem.

    If you are getting an "Update Unsuccessful" message...
    Some apps like "Android System Info" and "Apps2SD" have a feature that let you move apps to the SD card. Sometimes a portion of an App would actually remain on the phone causing the update error. Move the app off the SD card and back onto the phone and try updating again.

    If you are getting an "Install Unsuccessful" message...
    I'm not sure what causes this error. However if you go into your "settings/SD card & phone storage" and unmount the SD card you should be able to download and install the app that's giving you trouble. After your done mount your SD card. You may want to also restart your phone.
    06-30-2011 12:41 AM
  14. titanoman's Avatar
    After doing some research I figured out how to get around the problem.

    If you are getting an "Update Unsuccessful" message...
    Some apps like "Android System Info" and "Apps2SD" have a feature that let you move apps to the SD card. Sometimes a portion of an App would actually remain on the phone causing the update error. Move the app off the SD card and back onto the phone and try updating again.

    If you are getting an "Install Unsuccessful" message...
    I'm not sure what causes this error. However if you go into your "settings/SD card & phone storage" and unmount the SD card you should be able to download and install the app that's giving you trouble. After your done mount your SD card. You may want to also restart your phone.
    07-10-2011 02:08 PM
  15. titanoman's Avatar
    I don't know where to write this (what and where are tags, posts, threads, replies. I've never been in a forum before). I was just wanting to download google earth, but "item cant be found". It's not important enough to tear my new phone apart or anything (not no techie). Just wondering if anybody else has the same prob. Can't find help from google.
    07-10-2011 02:18 PM
  16. titanoman's Avatar
    I'm writing in this "tag"box just to see what it does. Sorry. (wish I had a dictionary on forum terms, little know android terms). Thank-you (whomever may read this)
    07-10-2011 02:23 PM
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