I created a custom live cd, and had this problem too.
It was solved by removing the file /usr/share/ubiquity/apt-setup,
then recreating it again by hand and giving it the right permissions
(see below)
1. sudo rm /usr/share/ubiquity/apt-setup
2. sudo nano /usr/share/ubiquity/apt-setup
3. enter the following in the file: #do nothing
4. save the file.
5. sudo chmod 755 /usr/share/ubiquity/apt-setup
I created a custom live cd, and had this problem too. ubiquity/ apt-setup,
It was solved by removing the file /usr/share/
then recreating it again by hand and giving it the right permissions
(see below)
1. sudo rm /usr/share/ ubiquity/ apt-setup ubiquity/ apt-setup ubiquity/ apt-setup
2. sudo nano /usr/share/
3. enter the following in the file: #do nothing
4. save the file.
5. sudo chmod 755 /usr/share/