apt – An installed package cannot be removed

For example, I have a home / documents / myProject project here

Open the terminal in this folder and install a package, for example morgan::

> sudo npm install morgan

in the terminal:

npm WARN myProject No repository field.
npm WARN myProject No license field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.12 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.12: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

+ morgan@1.10.0
updated 1 package and audited 2497 packages in 2.149s

2 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities

If I try the code above without sudo, it means that I have no permissions.

Now I'm trying to uninstall this package:

> sudo apt-get purge --auto-remove morgan

and the result is this:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package morgan

I know something is wrong, but I don't understand what.

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xapian – update the dovecot-dev package to v2.3.9.2

I am trying to install the fts-xapian module for dovecot on an OVH VPS cloud instance. I currently have Ubuntu 16.04. After compiling fts-xapian I see that it is installed in /usr/lib/dovecot/modulesWhen activating the plugin in my dovecot.conf, however, an error is displayed in my mail log:

Error: Couldn't load required plugin /usr/lib/dovecot/modules/lib21_fts_xapian_plugin.so: Module is for different ABI version 2.2.ABIv22(2.2.22) (we have 2.3.ABIv9(

I had to update the system intensive care unit to compile fts-xapian. I have put together the intensive care unit from here:


Here are the steps I followed:

$ add-apt-repository ppa:xapian/backports
$ apt update
$ apt upgrade
$ apt install python3-xapian
$ apt install libxapian-dev

EDIT /etc/apt/sources.list and ADD:

deb-src http://archive.ubuntu.com/ubuntu/ xenial main universe restricted multiverse #Added by software-properties
deb-src http://archive.ubuntu.com/ubuntu/ xenial-updates restricted main universe multiverse #Added by software-properties
deb-src http://archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties
deb-src http://security.ubuntu.com/ubuntu/ xenial-security restricted main universe multiverse #Added by software-properties
deb-src http://archive.ubuntu.com/ubuntu/ xenial-proposed restricted main universe multiverse #Added by software-properties


$ apt update
$ apt build-dep dovecot-core
$ apt install dovecot-dev
$ apt install libicu-dev

(The critical care unit needs to be updated for the next builds to work.)

$ cd /tmp
$ wget https://github.com/unicode-org/icu/releases/download/release-65-1/icu4c-65_1-src.tgz
$ tar -xvf icu4c-65_1-src.tgz
$ cd icu/source
$ ./configure --prefix=/usr
$ make install
$ icu-config --version

We should now see a system ICU version of 65.1

$ cd /usr/share
$ git clone https://github.com/grosjo/fts-xapian
$ cd fts-xapian
$ autoreconf -vi
$ ./configure --with-dovecot=/usr/lib/dovecot
$ make
$ make install

I think the problem is that Dovecot-Dev is at version 2.2.22 while Dovecot is now at version 2.3.92. My system tells me that Dovecot-Dev already has the latest version. How can I update dovecot-dev to match my dovecot? Do I have to compile from the source code?

How do I run a Mathematica package (.m) from Python with the "Wolfram Client Library for Python"?

This question is about calling a Mathematica package (.m file) from Python using the "Wolfram Client Library for Python" (https://github.com/WolframResearch/WolframClientForPython).

For completeness, consider the following Mathematica package:

AddTwo::usage = "AddTwo(a, b) returns a+b";
AddTwo(a_, b_) := a + b;

target: Call Python's AddTwo from the Wolfram Client Library for Python. If this is not currently supported, add this feature to the library.

Documentation for the library can be found at: https://reference.wolfram.com/language/WolframClientForPython/index.html.

A similar question asked before the Wolfram Client Library for Python was released is:
How do I run a Mathematica package (.m) from Python?

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Error: /var/tmp/rpm-tmp.s7ZexD: no RPM package (or package manifest): when installing MySQL in Centos 7

I am new to Linux and would like to install MySQL on the Centos 7 server. if I let them go sudo rpm -Uvh https://repo.mysql.com/mysql80-community-release-el7-3.noarch.rpm Command I get this error:

error: /var/tmp/rpm-tmp.s7ZexD: not an rpm package (or package manifest):

How can I solve this problem?

Can I claim if customs opens and damages my package even though the content is clearly identified and nothing is found? [migrated]

A model train was sent from Canada to Great Britain and clearly marked. The production took a year and was then sold. It was drilled from the bottom up by customs and the buyer no longer wants it. He was charged £ 101 on delivery for the pleasure of having his train wrecked.
Can I claim compensation?

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