md5sum does not work

[robinduncan]

I have just downloaded the lubuntu12.10 iso and tried to check it.

Neither of the instructions for doing this here:

https://help.ubuntu.com/community/HowToMD5SUM

are giving me any joy.

automatic method gives me: command not found

semi-automatic method: I really can't work out what I'm supposed to download here, or how...

Any help much appreciated :D

[ajgreeny]

What OS are you using when you try to check the md5sum?
Have you tried the manual method in whatever OS you're using?

[robinduncan]

What OS are you using when you try to check the md5sum?
Have you tried the manual method in whatever OS you're using?


Apologies, I meant to say I had tried the manual (not automatic) method, giving the above result.

I'm using ubuntu 11.04

Thanks for the reply

[prodigy_]

Use attached script. Usage:
python cd-md5-verify.py /dev/cdrom /path/to/file.iso

[robinduncan]

hi prodigy_

I get:

can't open file 'cd-md5-verify.py': [Errno 2] No such file or directory

But I have just seen that - I think - the fact that I downloaded the iso with transmission means that it was checked automatically. Does that sound right?

[Gyokuro]

Or you can type

openssl md5 downloaded.iso should do the same as md5sum which should be installed.

[oldos2er]

I'm using ubuntu 11.04


Just FYI, 11.04 is no longer supported, so you might want to upgrade.

[robinduncan]

Or you can type

openssl md5 downloaded.iso should do the same as md5sum which should be installed.

That gives me:

downloaded.iso: No such file or directory

[prodigy_]

can't open file 'cd-md5-verify.py': [Errno 2] No such file or directory
Sorry, I assumed you would run the script from the folder where you downloaded it. Anyway, try with full path:

python /path/to/cd-md5-verify.py /dev/cdrom /path/to/file.iso

[robinduncan]

I know 11.10 is no longer supported, but I was worried Ubuntu 12.04 would not work on my system. Someone recommended Lubuntu, and I'm trying to test-run it, but not getting very far.

I've just tried booting from the live dvd and choosing the check disk for errors option in the menu. It tells me that the kernel requires PAE, which I do not have. Would it be best to start again and download lubuntu 12.04?

[robinduncan]

thanks again prodigy_

I'm afraid you're dealing with a total illiterate.

With your second script I get:

python: can't open file '/path/to/cd-md5-verify.py': [Errno 2] No such file or directory

[prodigy_]

thanks again prodigy_

I'm afraid you're dealing with a total illiterate.

With your second script I get:

python: can't open file '/path/to/cd-md5-verify.py': [Errno 2] No such file or directory
/path/to is just a placeholder. :) You need to substitute it with actual path.

---

[Edit]: Just for fun - modified the script to look up in UbuntuHashes table.

#!/urs/bin/env python

import hashlib
import os
from sys import argv
import urllib2
import re

# http://www.joelverhagen.com/blog/2011/02/md5-hash-of-file-in-python/
def md5Checksum(file_path, file_size):
with open(file_path, 'rb') as open_file:
file_data = open_file.read(file_size)
md5_checksum = hashlib.md5(file_data)
return md5_checksum.hexdigest()

file_size = os.stat(argv[2]).st_size

for i in xrange(1,3):
print md5Checksum(argv[i], file_size), argv[i]

hashes_url = "https://help.ubuntu.com/community/UbuntuHashes"

try:
hashes_data = urllib2.urlopen(hashes_url).read()
table_rows = hashes_data.split('</tr>')

# Pattern for stripping HTML.
re_pattern = re.compile(r'.*>[^\w]?([\w\.-]+).*', re.DOTALL)

for table_row in table_rows:
row_fields = table_row.split('</td>')
row_fields[:] = [re.sub(re_pattern,
r'\1',
row_field) for row_field in row_fields]
try:
if row_fields[1] == argv[2]:
print "\nFound in DB:", row_fields[0], row_fields[1]
found = True
except IndexError:
pass

try:
found
except NameError:
print "\nNot found in DB!"
except:
print "\nCould not read UbuntuHashes DB."

[Gyokuro]

That gives me:

downloaded.iso: No such file or directory

I have used downloaded.iso as an example as I do not know what you have downloaded. For example in case you have downloaded ubuntu-12.04.2-alternate-amd64.iso you will enter in your download directory where your ISO is:

openssl md5 ubuntu-12.04.2-alternate-amd64.iso

[ajgreeny]

I've just tried booting from the live dvd and choosing the check disk for errors option in the menu. It tells me that the kernel requires PAE, which I do not have. Would it be best to start again and download lubuntu 12.04?
Yes, I'm afraid that if your system can not use pae kernels you will have to go back to Lubuntu 12.04, (or I think Xubuntu 12.04 as well).

There are theoretical ways around this by editing the .iso file but for a computer illiterate, as you call yourself, it is not an option to go that route. Lubuntu 12.04 is great, so you will still see most, if not all of what 12.10 can do.

PS:

But I have just seen that - I think - the fact that I downloaded the iso with transmission means that it was checked automatically. Does that sound right? To answer a query that nobody has yet responded to; yes, if you download the iso using transmission or other torrent client, it is checked and repaired if necessary as you download, so md5sum checks of the .iso are not strictly needed.