[R] Resolve unmet dependencies and install R 3.6 on chromebook

[Luigi Marongiu]

I tried to upgrade R from 3,3 to 3.6 on a Chromebook but I am getting this
error
```
.org/debian stretch InRelease
Hit:4 https://deb.debian.org/debian-security stretch/updates InRelease
Hit:5 https://deb.debian.org/debian stretch-backports InRelease
Hit:6 http://cran.wustl.edu/bin/linux/ubuntu xenial/ InRelease
Hit:7 https://deb.debian.org/debian stretch Release
Hit:8 https://deb.nodesource.com/node_13.x stretch InRelease
Hit:9 https://desktop-download.mendeley.com/download/apt stable InRelease
Ign:10 https://storage.googleapis.com/cros-packages/81 stretch InRelease
Hit:11 https://storage.googleapis.com/cros-packages/81 stretch Release
Hit:12 https://apt.llvm.org/stretch llvm-toolchain-stretch-7 InRelease
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/kivy-team/kivy/ubuntu focal
Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore
disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration
details.
W: Target Packages (Packages) is configured multiple times in
/etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target Translations (en_US) is configured multiple times in
/etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target Translations (en) is configured multiple times in
/etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target Packages (Packages) is configured multiple times in
/etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target Translations (en_US) is configured multiple times in
/etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target Translations (en) is configured multiple times in
/etc/apt/sources.list:3 and /etc/apt/sources.list:4
marongiuluigi using penguin:~$ sudo apt upgrade r-base r-base-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
  404  Not Found [IP: 2001:67c:1560:8008::15 80]
Ign:14 http://ppa.launchpad.net/kivy-team/kivy/ubuntu focal/main
Translation-en
Ign:15 http://ppa.launchpad.net/kivy-team/kivy/ubuntu focal/main
Translation-en_US
Ign:17 http://ppa.launchpad.net/kivy-team/kivy/ubuntu focal/main amd64
DEP-11 Metadata
Ign:18 http://ppa.launchpad.net/kivy-team/kivy/ubuntu focal/main all DEP-11
Metadata
Reading package lists... Done
W: The repository 'http://ppa.launchpad.net/kivy-team/kivy/ubuntu focal
Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore
potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration
details.
W: Target Packages (Packages) is configured multiple times in
/etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target Translations (en_US) is configured multiple times in
/etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target Translations (en) is configured multiple times in
/etc/apt/sources.list:3 and /etc/apt/sources.list:4
E: Failed to fetch
http://ppa.launchpad.net/kivy-team/kivy/ubuntu/dists/focal/main/binary-amd64/Packages
404  Not Found [IP: 2001:67c:1560:8008::15 80]
E: Some index files failed to download. They have been ignored, or old ones
used instead.
W: Target Packages (Packages) is configured multiple times in
/etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target Translations (en_US) is configured multiple times in
/etc/apt/sources.list:3 and /etc/apt/sources.list:4
W: Target Translations (en) is configured multiple times in
/etc/apt/sources.list:3 and /etc/apt/sources.list:4
marongiuluigi using penguin:~$ sudo apt-get install r-base
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 r-base : Depends: r-base-core (>= 3.4.4-1xenial0) but it is not going to
be installed
          Depends: r-recommended (= 3.4.4-1xenial0) but it is not going to
be installed
          Recommends: r-base-html but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
```
These packages are not even available because in theory I have uninstalled
R:
```
$ sudo apt remove purge r-base-core
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package purge
$ sudo apt remove purge r-base-recommended
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package purge
E: Unable to locate package r-base-recommended
$ sudo apt remove purge r-base
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package purge
$ sudo apt remove purge r-base-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package purge
```
Is there a way to solve this problem and install R 3.6 on a Chromebook?

-- 
Best regards,
Luigi

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