cvs2svn: 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/bin/cvs2svn - from package: cvs2svn

You may install the required package with command apt-get install {package}
Error in other languages:
cvs2svn: bevel nie gevind nie
cvs2svn: comandă negăsită
cvs2svn: comando não encontrado
cvs2svn: commande introuvable
cvs2svn: command not found
cvs2svn: käsku ei ole
cvs2svn: không tìm thấy lệnh
cvs2svn: komanda nerasta
cvs2svn: Kommando nicht gefunden.
cvs2svn: kommandot finns inte
cvs2svn: komut yok
cvs2svn: nie znaleziono polecenia
cvs2svn: níor aimsíodh an t-ordú
cvs2svn: no se encontró la orden
cvs2svn: no s'ha trobat l'ordre
cvs2svn: opdracht niet gevonden
cvs2svn: parancs nem található
cvs2svn: perintah tidak ditemukan
cvs2svn: príkaz nenájdený
cvs2svn: příkaz nenalezen
cvs2svn: команда не найдена
cvs2svn: командата не е открита
cvs2svn: 命令找不到
cvs2svn: コマンドが見つかりません