So, 1.5.1 is from artful (and that's EOL), and 1.2.29 is from xenial. Partial upgrades are not supported. I suggest you find some help returning your system to xenial, such as forums, mailing lists, or IRC.
So, 1.5.1 is from artful (and that's EOL), and 1.2.29 is from xenial. Partial upgrades are not supported. I suggest you find some help returning your system to xenial, such as forums, mailing lists, or IRC.