computer:ubuntu:thumbnails_in_ubuntu [spring2wiki]

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from: https://gist.github.com/h4cc/13450db3d4a7457f9b38#gistcomment-3162296

@hronellenfitsch, @xtermi2: Neither ufraw-batch nor gnome-raw-thumbnailer are available in 19.10, but I got raw thumbnails working by editing the gdk-pixbuf thumbnailer's MIME types. Open up /usr/share/thumbnailers/gdk-pixbuf-thumbnailer.thumbnailer and edit it to read as follows:

  [Thumbnailer Entry]
  TryExec=/usr/bin/gdk-pixbuf-thumbnailer
  Exec=/usr/bin/gdk-pixbuf-thumbnailer -s %s %u %o
  MimeType=image/png;image/bmp;image/x-bmp;image/x-MS-bmp;image/gif;image/x-icon;image/x-ico;image/x-win-bitmap;image/vnd.microsoft.icon;application/ico;image/ico;image/icon;text/ico;application/x-navi-animation;image/jpeg;image/x-portable-anymap;image/x-portable-bitmap;image/x-portable-graymap;image/x-portable-pixmap;image/tiff;image/x-xpixmap;image/x-xbitmap;image/x-tga;image/x-icns;image/x-quicktime;image/qtif;image/x-3fr;image/x-adobe-dng;image/x-arw;image/x-bay;image/x-canon-cr2;image/x-canon-crw;image/x-cap;image/x-cr2;image/x-crw;image/x-dcr;image/x-dcraw;image/x-dcs;image/x-dng;image/x-drf;image/x-eip;image/x-erf;image/x-fff;image/x-fuji-raf;image/x-iiq;image/x-k25;image/x-kdc;image/x-mef;image/x-minolta-mrw;image/x-mos;image/x-mrw;image/x-nef;image/x-nikon-nef;image/x-nrw;image/x-olympus-orf;image/x-orf;image/x-panasonic-raw;image/x-panasonic-raw2;image/x-pef;image/x-pentax-pef;image/x-ptx;image/x-pxn;image/x-r3d;image/x-raf;image/x-raw;image/x-rw2;image/x-rwl;image/x-rwz;image/x-samsung-srw;image/x-sigma-x3f;image/x-sony-arw;image/x-sony-sr2;image/x-sony-srf;image/x-sr2;image/x-srf;image/x-x3f;

If you've a raw.thumbnailer or similar, delete it.

Quit Nautilus and delete the thumbnail cache (or it won't even try to regenerate previously-failed thumbnails) with rm -rf ~/.cache/thumbnails/* then open Nautilus and browse to a directory with raw files in it.

Seems a bit slower than the old ufraw-batch method, but it's working here!