strange bug after a fresh install

[Uwe Brauer]

Hi

I freshly installed Ubuntu 20.04 and used the pre compiled Emacs 26, I
copies also all my init files.

When I open an org file I obtain an error message I don't understand and
attach any help is appreciated

Regards

Uwe Brauer 

Debugger entered--Lisp error: (json-readtable-error 47)
  signal(json-readtable-error (47))
  json-read()
  json-read-from-string("/home/oub/.login: No such file or directory.\njupyter: 
Command not found.\n")
  ob-ipython--get-kernels()
  ob-ipython-auto-configure-kernels()
  run-hooks(change-major-mode-after-body-hook text-mode-hook outline-mode-hook 
org-mode-hook)
  apply(run-hooks (change-major-mode-after-body-hook text-mode-hook 
outline-mode-hook org-mode-hook))
  run-mode-hooks(org-mode-hook)
  org-mode()
  set-auto-mode-0(org-mode nil)
  set-auto-mode()
  normal-mode(t)
  after-find-file(nil t)
  find-file-noselect-1(#<buffer INSTALL-Trusty.org> 
"~/kde3-trinity/INSTALL-Trusty.org" nil nil "~/kde3-trinity/INSTALL-Trusty.org" 
(17304181 66309))
  find-file-noselect("/home/mjpons/kde3-trinity/INSTALL-Trusty.org" nil nil nil)
  #f(compiled-function (filename &optional wildcards) "Edit file 
FILENAME.\nSwitch to a buffer visiting file FILENAME,\ncreating one if none 
already exists.\nInteractively, the default if you just type RET is the current 
directory,\nbut the visited file name is available through the minibuffer 
history:\ntype \\[next-history-element] to pull it into the minibuffer.\n\nThe 
first time \\[next-history-element] is used after Emacs prompts for\nthe file 
name, the result is affected by `file-name-at-point-functions',\nwhich by 
default try to guess the file name by looking at point in the\ncurrent buffer.  
Customize the value of `file-name-at-point-functions'\nor set it to nil, if you 
want only the visited file name and the\ncurrent directory to be available on 
first \\[next-history-element]\nrequest.\n\nYou can visit files on remote 
machines by specifying something\nlike /ssh:SOME_REMOTE_MACHINE:FILE for the 
file name.  You can\nalso visit local files as a different user by 
specifying\n/sudo::FILE for the file name.\nSee the Info node `(tramp)File name 
Syntax' in the Tramp Info\nmanual, for more about this.\n\nInteractively, or if 
WILDCARDS is non-nil in a call from Lisp,\nexpand wildcards (if any) and visit 
multiple files.  You can\nsuppress wildcard expansion by setting 
`find-file-wildcards' to nil.\n\nTo visit a file without any kind of conversion 
and without\nautomatically choosing a major mode, use \\[find-file-literally]." 
(interactive #f(compiled-function () #<bytecode 0x17441c1>)) #<bytecode 
0x1b4a57>)("/home/mjpons/kde3-trinity/INSTALL-Trusty.org" nil)
  ad-Advice-find-file(#f(compiled-function (filename &optional wildcards) "Edit 
file FILENAME.\nSwitch to a buffer visiting file FILENAME,\ncreating one if 
none already exists.\nInteractively, the default if you just type RET is the 
current directory,\nbut the visited file name is available through the 
minibuffer history:\ntype \\[next-history-element] to pull it into the 
minibuffer.\n\nThe first time \\[next-history-element] is used after Emacs 
prompts for\nthe file name, the result is affected by 
`file-name-at-point-functions',\nwhich by default try to guess the file name by 
looking at point in the\ncurrent buffer.  Customize the value of 
`file-name-at-point-functions'\nor set it to nil, if you want only the visited 
file name and the\ncurrent directory to be available on first 
\\[next-history-element]\nrequest.\n\nYou can visit files on remote machines by 
specifying something\nlike /ssh:SOME_REMOTE_MACHINE:FILE for the file name.  
You can\nalso visit local files as a different user by specifying\n/sudo::FILE 
for the file name.\nSee the Info node `(tramp)File name Syntax' in the Tramp 
Info\nmanual, for more about this.\n\nInteractively, or if WILDCARDS is non-nil 
in a call from Lisp,\nexpand wildcards (if any) and visit multiple files.  You 
can\nsuppress wildcard expansion by setting `find-file-wildcards' to nil.\n\nTo 
visit a file without any kind of conversion and without\nautomatically choosing 
a major mode, use \\[find-file-literally]." (interactive #f(compiled-function 
() #<bytecode 0x1744301>)) #<bytecode 0x1b4a57>) 
"/home/mjpons/kde3-trinity/INSTALL-Trusty.org")
  apply(ad-Advice-find-file #f(compiled-function (filename &optional wildcards) 
"Edit file FILENAME.\nSwitch to a buffer visiting file FILENAME,\ncreating one 
if none already exists.\nInteractively, the default if you just type RET is the 
current directory,\nbut the visited file name is available through the 
minibuffer history:\ntype \\[next-history-element] to pull it into the 
minibuffer.\n\nThe first time \\[next-history-element] is used after Emacs 
prompts for\nthe file name, the result is affected by 
`file-name-at-point-functions',\nwhich by default try to guess the file name by 
looking at point in the\ncurrent buffer.  Customize the value of 
`file-name-at-point-functions'\nor set it to nil, if you want only the visited 
file name and the\ncurrent directory to be available on first 
\\[next-history-element]\nrequest.\n\nYou can visit files on remote machines by 
specifying something\nlike /ssh:SOME_REMOTE_MACHINE:FILE for the file name.  
You can\nalso visit local files as a different user by specifying\n/sudo::FILE 
for the file name.\nSee the Info node `(tramp)File name Syntax' in the Tramp 
Info\nmanual, for more about this.\n\nInteractively, or if WILDCARDS is non-nil 
in a call from Lisp,\nexpand wildcards (if any) and visit multiple files.  You 
can\nsuppress wildcard expansion by setting `find-file-wildcards' to nil.\n\nTo 
visit a file without any kind of conversion and without\nautomatically choosing 
a major mode, use \\[find-file-literally]." (interactive #f(compiled-function 
() #<bytecode 0x17ba42d>)) #<bytecode 0x1b4a57>) 
"/home/mjpons/kde3-trinity/INSTALL-Trusty.org")
  find-file("/home/mjpons/kde3-trinity/INSTALL-Trusty.org")
  dired-find-file()
  funcall-interactively(dired-find-file)
  call-interactively(dired-find-file nil nil)
  command-execute(dired-find-file)