unicoverage: 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/unicoverage - from package: unifont-bin

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

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