i have installed ubuntu 14.5 LTS ,now i would like to upgrade it to 15. LTS .Without losing data and other applications i installed on ubuntu 14.4 LTS .Can it possible ?
That is not an existing version. I assume you mean 14.04 LTS?
That is not an existing version. I assume you mean 16.04 LTS?
Can it possible ?
Yes. But I suggest you make a backup of your data. Success depends largely on your accuracy and handling of the upgrade when the upgrade show errors or possible input you need to provide.