Update debian.md

guat/guat_installation/debian.md

@@ -205,7 +205,7 @@ cd /var/www/html
 mkdir MaarchParapheur
 cd MaarchParapheur
 git clone -b 20.03 https://labs.maarch.org/maarch/MaarchParapheur .
-git checkout tags/$(git describe --tags `git rev-list --tags=20.03.* --max-count=1`) -b $(git describe --tags `git rev-list --tags=20.03.* --max-count=1`)
+git checkout tags/$(git tag --sort=committerdate | grep -E '20\.03\.([0-9]+)$' | tail -1) -b $(git tag --sort=committerdate | grep -E '20\.03\.([0-9]+)$' | tail -1)
 
 ```