kcov: 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/kcov - from package: kcov

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