Linux -y install 에러

Linux에서 Oracle을 설치하기 전에 alien, libaio1, unixodbc를 설치하는 과정에서 에러가 발생하였다. root@hwchae:/home/hwcotton/Disk1# apt -y install alien libaio1 unixodbc Reading package lists... Done Building dependency tree... Done Reading state information... Done Package unixodbc is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available ..