dbsessmgr2: 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/dbsessmgr2 - from package: mono-xsp2

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

Error in other languages:
dbsessmgr2: bevel nie gevind nie
dbsessmgr2: comandă negăsită
dbsessmgr2: comando não encontrado
dbsessmgr2: commande introuvable
dbsessmgr2: command not found
dbsessmgr2: käsku ei ole
dbsessmgr2: không tìm thấy lệnh
dbsessmgr2: komanda nerasta
dbsessmgr2: Kommando nicht gefunden.
dbsessmgr2: kommandot finns inte
dbsessmgr2: komut yok
dbsessmgr2: nie znaleziono polecenia
dbsessmgr2: níor aimsíodh an t-ordú
dbsessmgr2: no se encontró la orden
dbsessmgr2: no s'ha trobat l'ordre
dbsessmgr2: opdracht niet gevonden
dbsessmgr2: parancs nem található
dbsessmgr2: perintah tidak ditemukan
dbsessmgr2: príkaz nenájdený
dbsessmgr2: příkaz nenalezen
dbsessmgr2: команда не найдена
dbsessmgr2: командата не е открита
dbsessmgr2: 命令找不到
dbsessmgr2: コマンドが見つかりません