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I tried upgrading raspbian from Stretch to Buster using this tutorial:

https://pimylifeup.com/upgrade-raspbian-stretch-to-raspbian-buster/

At the end of step 6 (maybe at 99% of the upgrade), I had a lot of errors. Now, a couple of commands give me lots of warnings related to regular expressions. For example, when I dot sudo apt update, I get 

W: Invalid regular expression '^linux-image-[a-z0-9]*$' in configuration option 'APT::NeverAutoRemove' will be ignored.
W: Invalid regular expression '^linux-image-[a-z0-9]*-[a-z0-9]*$' in configuration option 'APT::NeverAutoRemove' will be ignored.

I also get 2 dozens of theses kind of messages when opening nano and other commands :

Erreur dans /usr/share/nano/gentoo.nanorc à la ligne 18 : Mauvaise expr. rationnelle « \$[-0-9@*#?$!] » : Fin d'intervalle invalide
Erreur dans /usr/share/nano/gentoo.nanorc à la ligne 19 : Mauvaise expr. rationnelle « \$\{[#!]?([-@*#?$!]|[0-9]+|[[:alpha:]_][[:alnum:]_]*)(\[([[:digit:]]|@)+\])?(([#%/]|:?[-=?+])[^}]*\}|\[|\}) » : Fin d'intervalle invalide

For those not speaking french, it says something about "bad regular expressions".

I also had a lot of errors about dpkg. When doing sudo dpkg --configure -a, 4 packages seemed to cause problem : 

gnome-icon-theme
exim4-config
exim4-base
exim4-daemon-light

I did a sudo apt remove --purge of these four packages. It solved the errors about dpkg, but I still have the errors about regular expressions.

jaja360
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    If you choose to ignore the Foundation advice and try an unsupported upgrade you have to debug the inevitable issues. Most of us did a fresh install (which is faster in the long run). – Milliways Dec 03 '19 at 05:37
  • In your case the [last point](https://raspberrypi.meta.stackexchange.com/a/2198/33476) of the discussion about the merits of tutorials fully applies. You shouldn't have run [`sudo rpi-update`](https://raspberrypi.stackexchange.com/a/4363/33476): this installs *test* versions of kernel and firmware. If anything, that makes the upgrade harder to complete. – Dmitry Grigoryev Dec 03 '19 at 12:40
  • So you think the problem is due to the `rpi-update` command ? Is there a way to downgrade to the last supported firmware version ? – jaja360 Dec 03 '19 at 15:54
  • Please prepend the commands with `LANG=C` before posting them. E.g. `LANG=C ls no-file` should give you `ls: cannot access 'no-file': No such file or directory`. – Ingo Dec 04 '19 at 14:18
  • It works ! When I add LANG=C before my commands, there's no more regex errors. What does it means ? How to make this fix permanent ? – jaja360 Dec 04 '19 at 18:11

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