我在 askbuntu 里面找到了答案：
Change default user folders path
具体做法：
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| vi ~/.config/user-dirs.dirs
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以下是我的配置：
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| # This file is written by xdg-user-dirs-update
# If you want to change or add directories, just edit the line you're
# interested in. All local changes will be retained on the next run.
# Format is XDG_xxx_DIR="$HOME/yyy", where yyy is a shell-escaped
# homedir-relative path, or XDG_xxx_DIR="/yyy", where /yyy is an
# absolute path. No other format is supported.
#
XDG_DESKTOP_DIR="/home/hcy/Desktop/"
XDG_DOWNLOAD_DIR="/home/hcy/Downloads/"
XDG_TEMPLATES_DIR="/home/hcy/Templates/"
XDG_PUBLICSHARE_DIR="/home/hcy/Public/"
XDG_DOCUMENTS_DIR="/home/hcy/Documents/"
XDG_MUSIC_DIR="/home/hcy/Music/"
XDG_PICTURES_DIR="/home/hcy/Pictures/"
XDG_VIDEOS_DIR="/home/hcy/Videos/"
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