missing bash in /usr/bin seems to cause auctex to break on buffer initialization

[jfbu]

Hi,
This is on an Ubuntu 18 with no admin rights,

On trying to open any .tex file I hit against

Debugger entered--Lisp error: (file-error "Searching for program" "Aucun 
fichier ou dossier de ce type" "/usr/bin/bash")
  call-process("/usr/bin/bash" nil t nil "-c" "atril --help")
  apply(call-process "/usr/bin/bash" nil t nil ("-c" "atril --help"))
  process-file("/usr/bin/bash" nil t nil "-c" "atril --help")
  shell-command-to-string("atril --help")
  TeX-view-program-select-evince("mate" "atril")
  byte-code(" 

byte-code does not copy paste easily here

  apply(TeX-tex-mode nil)
  tex-mode()
  set-auto-mode-0(tex-mode nil)
  set-auto-mode()
  normal-mode(t)

And indeed I don't have /usr/bin/bash but I see only /bin/bash

Besides I don't have any atril only evince


This happens with AucTeX 12.2.0, and also 12.2.3

If I click in backtrace on TeX-tex-mode it  opens the tex.el file in the 
elpa/auctex-12.2.0/

PS : I am opening this ticket but will probably not be able to interact much 
because I won't have physical access to this terminal any time soon

Best
Jean-François