mount -t iso9660 -o ro,loop,noauto /your/texlive.iso /mnt/iso
Make this site your main repository:
tlmgr option repository https://mirror.ischo.org/tex-archive/systems/texlive/tlnet
Make this site your aux repository: If you do not need the KTUG Private Repository for Korean LaTeX users, ignore the items from 2 to 5.
tlmgr repository add https://mirror.ischo.org/KTUG/texlive/tlnet ktug
If you have never registered the pinning info to ktug repository, then execute the following command just once: for only KTUG Private Repository
tlmgr pinning add ktug "*"
test KTUG Private Repository
tlmgr install jiwonlipsum
add GPG key for KTUG Private Repository: If your are on a system
without gpg, just skip this.
wget https://mirror.ischo.org/KTUG/texlive/tlnet/ktugrepo.pub.txt &&
tlmgr key add /path/to/ktugrepo.pub.txt
Update TEXLIVE
tlmgr update --all --self
Some useful commands:
tlmgr repository list
tlmgr pinning show