RNG should ignore numers that have already been given [Python]

I'm using a random number generater to select a question from a list at random, if the question has already been answered it should skip and reroll until it gets a number that hasn't been given yet.

It works until the options become too limited. It'll roll ~4 times. If it still doesn't have a number that hasn't been given before, it'll give an "index out of range" error.

Sample:

from random import randint
counter = int(0) # Max value, count the amount of questions in the list
done = [] # Already been rolled, ignore these values
list = open('questions.txt').readlines()

for l in list:
    counter +=1

try:
   # While there are less values in <done> than <counter>, roll and add to list
   while len(done) < counter:
       question = randint(1,counter)
       while question in done:
           print('Skipped [%i]' % question) # Check if ignored
           question = randint(1,counter) # Reroll
       else:
           # Add to list so it knows the question has already been asked
           done.append(question) # Add to list with given values
   else:
       print('Finished!\n')
except Exception as e:
   print(e) # Show error if any

I have no clue what i've done wrong, please help.

Thanks :)