[Solved] Ubuntu Link to Learn it

Hello,
I am a new Linux user and have a new build just assembled. I have a working Ubuntu OS on my new PC and have to learn how to use it. I have not added programs to use for Internet downloads. For instance I was trying to open up a download and got an error message. " end of directorysignature not found. ..."

Any links helpful to learn how to use it? THanks

thanks for the response. I have no idea what that means, though.

Basically, if the file you are downloading is large, there's a greater-than-zero chance that part of the download is corrupted (essentially, if during the period of download, you receive more that 2^32 packets and there is some agent in the connection that tends to cause bit errors, chances are you will have a checksum collision, or an undetected corruption).

Some sources for larger downloads (e.g. Linux DVD ISOs) will provide MD5 and/or SHA(128|256) "hashes" for the file you are downloading. Essentially, once you've completed the download, you use a tool (like this for either type and many more). Run the tool on your download and ensure that the resulting number (it will be a hexidecimal number) matches what is indicated by the download source.

Hashes have the property that a slight difference between two file will result in (with a high level of probability) wildly-different hashes, so it should be pretty easy to spot differences if there was a corruption in downloading. As an example:

If your download source does not provide a hash for comparison, you could simply attempt to re-download it and compare the hashes of the two files

Ok, thank you guys But my system does work online. I have been able to go online with the cd running. I ran it installed on the hard drive also. So, I have just to look at the setup or the BIOS maybe. I know it works. It just needs to be starting properly. Somehow, I think it is BIOS. My system is using UEFI BIOS and it has a lot of options.