http://ftp.agh.edu.pl/ubuntu/
http://ftp.icm.edu.pl/pub/Linux/ubuntu/
http://mirror.chmuri.net/ubuntu/
https://ftp.psnc.pl/linux/ubuntu/
https://mirroronet.pl/pub/mirrors/ubuntu/
http://ubuntu.man.lodz.pl/ubuntu/
http://ftp.vectranet.pl/ubuntu/
http://ubuntu.task.gda.pl/ubuntu/
http://archive.ubuntu.com/ubuntu/