[Solved] What is this mysterious “ecrm1000” missing file?

Anne Aunyme Asks: What is this mysterious “ecrm1000” missing file?
I am trying to make a pdf from a document I got online, and I have a hard time doing it. Apparently pflatex calls kpathsea, which calls mktextfm, which needs a “ecrm1000” file.

A research about it have shown me other logs of error where this appears (like this question or this one), but with no solution about it. The latter even is mentioned as duplicate without actually providing a link to the previously asked question.

I am on the lastest version of ubuntu, with the recommended settings of TeX-Live (I only added manually the french babel extension and textpos) There is the logs:

$ pdflatex prapport.tex 
This is pdfTeX, Version 3.14159265-2.6-1.40.16 (TeX Live 2015/Debian) (preloaded format=pdflatex)
 restricted write18 enabled.
entering extended mode
LaTeX2e <2016/02/01>
Babel <3.9q> and hyphenation patterns for 5 language(s) loaded.
Document Class: report 2014/09/29 v1.4h Standard LaTeX document class
kpathsea: Running mktextfm ecrm1000
mktextfm: Running mf-nowin -progname=mf mode:=ljfour; mag:=1; nonstopmode; input ecrm1000
This is METAFONT, Version 2.7182818 (TeX Live 2015/Debian) (preloaded base=mf)

kpathsea: Running mktexmf ecrm1000
! I can't find file `ecrm1000'.
<*> ...ljfour; mag:=1; nonstopmode; input ecrm1000

Please type another input file name
! Emergency stop.
<*> ...ljfour; mag:=1; nonstopmode; input ecrm1000

Transcript written on mfput.log.
grep: ecrm1000.log: Aucun fichier ou dossier de ce type
mktextfm: `mf-nowin -progname=mf mode:=ljfour; mag:=1; nonstopmode; input ecrm1000' failed to make ecrm1000.tfm.
kpathsea: Appending font creation commands to missfont.log.

! Font T1/cmr/m/n/10=ecrm1000 at 10.0pt not loadable: Metric (TFM) file not fou
<to be read again> 
l.105 fontencodingencodingdefaultselectfont


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