solv: 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 CentOS possible default full paths are:

/usr/bin/solv - from package: libsolv-demo

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/solv - from package: libsolv-tools

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

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