I have an ASUS K53E (Intel i5 CPU, 4GB DDR3 RAM, 500GB HD) notebook computer that I bought new in 2012. I run Windows 7 Home Premium on it, and have (had?) Ubuntu 12 on it too. When I downloaded Ubuntu initially, it placed a purple dual-boot startup program on the computer that asks me to choose either Windows or Ubuntu. The startup program says, "Ubuntu, with Linux 3.2.0-54 generic pae".
It all worked fine until the other day. While updating Ubuntu (to v. 14, I believe), it hiccuped and the download stopped before completion. I can no longer enter Ubuntu, although the dual-boot startup program still allows me to select and use Windows. I tried the "Ubuntu, with Linux 3.2.0-54 geneic pae (recovery mode)". However, every time I try to start Ubuntu, only text appears. The last line always says: "ountall: Disconnected from Plymouth".
What should I do?
1st choice: How can I fix and update Ubuntu?
-- or --
2nd choice: How can I delete Ubuntu completely (and the dual-boot startup program)?
I'd rather keep an up-to-date version of Ubuntu on the laptop, as I am thinking of ditching Windows altogether, but I do want to keep Windows running for the time being.