in.uucpd: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/sbin/in.uucpd - from package: uucp

You may install the required package with command apt-get install {package}
Error in other languages:
in.uucpd: bevel nie gevind nie
in.uucpd: comandă negăsită
in.uucpd: comando não encontrado
in.uucpd: commande introuvable
in.uucpd: command not found
in.uucpd: käsku ei ole
in.uucpd: không tìm thấy lệnh
in.uucpd: komanda nerasta
in.uucpd: Kommando nicht gefunden.
in.uucpd: kommandot finns inte
in.uucpd: komut yok
in.uucpd: nie znaleziono polecenia
in.uucpd: níor aimsíodh an t-ordú
in.uucpd: no se encontró la orden
in.uucpd: no s'ha trobat l'ordre
in.uucpd: opdracht niet gevonden
in.uucpd: parancs nem található
in.uucpd: perintah tidak ditemukan
in.uucpd: príkaz nenájdený
in.uucpd: příkaz nenalezen
in.uucpd: команда не найдена
in.uucpd: командата не е открита
in.uucpd: 命令找不到
in.uucpd: コマンドが見つかりません