/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/ is in ltsp-server 5.5.1-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/000-basic-configuration
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/000-init-whitelist
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/000-progress
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/001-apt-opt
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/001-set-arch
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/001-set-dist
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-bindfiles
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-etc-clean
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-etc-hostname
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-etc-inittab
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-etc-mtab
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-etc-resolv
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-etc-sysinit
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-locales
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-make-dirs
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-nbd-client
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-nbdswapd
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-ssh-keys
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-sysctl
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-tftpd
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/010-udev
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/011-manage-mirror
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/015-gen-ltsp-base
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/020-apt-get-update
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/020-root-tmp-dir
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/030-early-packages
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/030-i18n
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/030-update-sshkeys
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/035-update-kernels
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/040-kernel
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/040-serial-console
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/041-kernel-modules
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/045-initrd
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/050-late-packages
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/090-clean-package-cache
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/095-exports
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/095-rootpass
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/100-dev
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/100-etc-passwdqc
/usr/share/ltsp/plugins/ltsp-build-client/ALTLinux/999-ze-end