syncevolution: command not found

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/bin/syncevolution - from package: syncevolution

You may install the required package with command apt-get install {package}

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