bareos-dbcheck: 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/bareos-dbcheck - from package: bareos-database-tools
/usr/lib/debug/usr/sbin/bareos-dbcheck - from package: bareos-dbg

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