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filename=$(curl https://mirrors.tuna.tsinghua.edu.cn/ubuntu/pool/main/u/ubuntu-wallpapers/ | \
  grep -oE "ubuntu-wallpapers_.*?.orig.tar.gz" | \
  tail -n 1)

wget https://mirrors.tuna.tsinghua.edu.cn/ubuntu/pool/main/u/ubuntu-wallpapers/${filename} && \
  mkdir ubuntu-wallpapers temp && \
  tar -xvf $filename -C temp && \
  find temp -type f (\ -name "*.jpg" -o -name "*.png" \) -exec mv {} ubuntu-wallpapers/ \;
  rm -rf temp $filename