I'm not 100% clear on the relationship between Ubuntu and Debian. It seems like Ubuntu is (or was, at some point) some sort of fork of Debian; and that they share the same package manager (Ubuntu uses the unstable something and Debian uses the release or stable thing).  My question: there was a  (Debian 9 as it so happens). Will the next version(s) of Ubuntu be updated to use something from Debian 9?   Or are the two distros pretty much independent now?
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which of the two it is?
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Which repository will Ubuntu choose to download a package from if the same package is available in more than one repos? Suppose a package A was initially installed from repository X and later I added repo Y which also has package A. Which repo will be chosen to update the package? Also if I completely remove this package and try to reinstall then which repo would be preferred by Ubuntu to install the package?
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I would like to know how to install another distro side by side with Ubuntu 18.04.2.    Currently 18.04.2 resides on the entire hard drive.  Would I need to make another partition?  How would I go about doing this?  Would I be able to use the same GRUB menu?
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I am trying to write a script which works based on the knowledge that each Linux Mint release was based on a particular Ubuntu release.  However, I do not want to install Linux Mint to verify that, but instead let the users of the script test it, if they need it.  Can I rely on the presence of /etc/debian_version, though? I am doing this in order to detect Debian and its derivatives. It works reliably on Debian and Ubuntu, but does Linux Mint have this file?  Note: I am aware of lsb_release and I am using that in order to figure out more details later on. But the existence of /etc/debian_version is a way to make assumptions about certain things before even checking for and invoking lsb_release.
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In the  of Ubuntu, I see that both the 14.04.1 and the 14.04 versions are offered for download. Do I need them both? That is, is 14.04 a prerequisite for installing 14.04.1? Or can I just download the last version ubuntu-14.04.1-desktop-amd64.iso?
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Is there a standard procedure to 'unit test' an Ubuntu system against the deb packages?  Assume, a system has ubuntu-desktop installed according to the package manager. Can I find out, whether the file system has all the files in ubuntu-desktop and dependencies?   related question:
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I'd like to try PHP7.0 on Debian Jessie and am trying to install it from sid. However,  depends on  which depends on php-common &gt; 18 while  in sid is at 17. Does this mean it's simply impossible to install php7.0 from this distribution at the moment? Why is that?  I know that it is possible to install from source as explained e.g. , I'm just asking about the official packages.    Note: the packages in sid have been fixed and it is now (Jan 6, 2016) possible to install from there.
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What is Unix, Linux, Ubuntu?  Are they the same thing or different versions or completely different stuff?  This has always made me confused, any explanation would be great.
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I just want to know, what is the difference between ubuntu Minimal, Desktop &amp; Server Editions? How they differ? is it by performance? If yes which one is recommended for a normal user and which one is recommended for a advanced user ?
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We are running Debian Etch, Lenny and Squeeze because upgrades have never been done in this shop; we have over 150 systems running various Debian versions.   In light of the "shell shock" of this week, I assume I need to upgrade bash.  I do not know Debian so I am concerned.   Can I merely execute apt-get install bash on all of my Debian systems and get the correct Bash package while my repository is pointed at a Squeeze entry. If not, what other course of action do I have?
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I installed Debian 7 using a DVD version, so every time I'm trying to install something using apt-get, the system ask me to mount the DVD. Is there a way to avoid that (inserting every time the dvd).
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As a developer of free software, I want to get my application into Ubuntu.  Should I provide a source tarball and ask for packaging? Or should I create a package myself? Should I target Ubuntu directly, or should I try to get into Debian and then into Ubuntu automatically?
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So, I currently have BOSS Linux and I am going to install Debian (currently installing right now)   And I want my older OS (BOSS linux), on the first position and the debian, (freshly installed) to be on the second. How do I do that?
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On Debian systems (and derivatives):  $ dpkg --search /bin/ls coreutils: /bin/ls   That is, the file /bin/ls belongs to the Debian package named coreutils.  But this only works if the package is installed. What if it's not?
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Anyway....there is Ubuntu 12.04 LTS and the normal 12.10 version. Is that the same with Lubuntu? On their site, for some reason, they seem to be promoting the 12.10 version while for me an LTS is always more appealing. I am wondering if they have the same ideology as the Ubuntu team.  UPDATE: Is it okay to talk about Lubuntu here at all? I understand that it is a flavour of Ubuntu...but still. Are they 2 very different teams?
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My os was installed from debian 8.5.0 amd64. Execute commands after installation.  cat /etc/issue Debian GNU/Linux 8 \n \l   No 8.5 here.  cat /proc/version Linux version 3.16.0-4-amd64 (debian-kernel@lists.debian.org) (gcc version 4.8.4 (Debian 4.8.4-1) ) #1 SMP Debian 3.16.43-2+deb8u2 (2017-06-26)   No 8.5 here too.  Does deb8u2 means debian 8.5?
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I have an Asus K55V and I'm wondering which version of Ubuntu I should be attempting to use. The website offers 12.04 (LTS) and 12.10.