/usr/share/bash-completion/completions/uupdate is in devscripts 2.17.6+deb9u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | # /usr/share/bash-completion/completions/uupdate
# Bash command completion for ‘uupdate(1)’.
# Documentation: ‘bash(1)’, section “Programmable Completion”.
_uupdate()
{
    local cur prev options
    COMPREPLY=()
    cur=${COMP_WORDS[COMP_CWORD]}
    prev=${COMP_WORDS[COMP_CWORD-1]}
    options='--upstream-version -v --rootcmd -r --pristine -u --no-pristine\
             --symlink -s --no-symlink --no-conf --noconf --help -h --version\
             --force-bad-version -b'
    case $prev in
        --pristine | -u)
            COMPREPLY=( $(
                compgen -G "${cur}*[!debian].tar.gz"
                compgen -G "${cur}*[!debian].tar.bz2"
                compgen -G "${cur}*[!debian].tar.xz"
                compgen -G "${cur}*.tgz"
                compgen -G "${cur}*.zip"
                compgen -G "${cur}*.lzma" ) )
            ;;
        --help | -h | --version)
           ;;
        *)
            COMPREPLY=( $( compgen -W "$options" | grep "^$cur" ) )
            ;;
    esac
    return 0
}
complete -F _uupdate -o filenames uupdate
# Local variables:
# coding: utf-8
# mode: shell-script
# indent-tabs-mode: nil
# End:
# vim: fileencoding=utf-8 filetype=sh expandtab shiftwidth=4 :
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