ggcov: 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/ggcov - from package: ggcov

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