Looks like a problem with the block chain database. Same problem as here:https://bitcointalk.org/index.php?topic=30729.0
On ubuntu, those files are stored in ~/.bitcoin
Try deleting everything there except your wallet.dat and redownload the blockchain.
Also, if the wallet.dat was encrypted with 0.5, I suspect 0.4 might not be able to read it, so do the above using 0.5.
Thanks very much. Replacing the ( wallet.dat file only ) worked way better than replacing all 3 files. That wallet file was v.0.4 that I had
backed up initially. works great and I have my wallet back. Pretty happy I didn't lose the $150.00.
I am downloading the blocks as I type this.
U rock P4man
On a side note:
I did try doing what paraipan suggested - after I had deleted my wallet dat. file and loaded the version 0.5 bitcoin program.
It didn't work but that isn't necessarily the programs fault as by that time I had changed so many settings that it prolly was doomed to fail anyways. LOL.
Anyway, something happened that I feel people need to know about;
I had deleted my original wallet.dat file and loaded a new one off 0.5.
Then I did "sudo apt-add-repository ppa:bitcoin/bitcoin" then do "sudo apt-get update" and install bitcoin with
"sudo apt-get install bitcoin-qt" that paraipan suggested.
That didn't work so I decided to go back to original Ubuntu laptop install. I rebooted with .iso disk and it wouldn't reformat and do fresh install. Hmmm.
I pulled out Ubuntu.iso disk and threw in a Derick's boot and nuke I have laying around. I nuked the hard drive and got a very strange message at the end of the procedure. "your disk has bad sectors".
Well I know for a fact the disk is good cause I checked before I started all this. Hmmm .... a chance that that would be a newly installed
ppa file that can't be overwritten?
I pulled out the Derick's disk and threw in a memtest86 disk to wipe the memory rebooted and ran the Derick's boot and nuke again.
WOW...what a surprise - my hard drive " bad sectors " dissapeared.
Like I said before I cant read code and the last programing I did was Fortran in junior high.
There might be a rat in that ppa woodpile. beware.
Anyways thanks again P4man