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I did a sudo apt-get remove util-linux. I messed up. Fortunately, I took the backup and had sharing options on it to read and write and I have Linux-Mint as well and took the backup. <br />
However, when I am selecting ubuntu while booting, it is saying:<br />
error: you have to load kernel first. Please suggest.
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I did a sudo apt-get remove util-linux. I messed up. Fortunately, I took the backup and had sharing options on it to read and write and I have Linux-Mint as well and took the backup. 
However, when I am selecting ubuntu while booting, it is saying:
error: you have to load kernel first. Please suggest.

Ubuntu Kernel not loading up.

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).