как отключить, проявляют-thumbnailer

Для отключения его в масштабе всей системы прокомментируйте Exec= строка в /usr/share/thumbnailers/evince.thumbnailer:

sudo sed -i 's/^Exec=/# &/' /usr/share/thumbnailers/evince.thumbnailer

user@user-X550CL ~/tmp % sudo sed -i 's/^Exec=/# &/' /usr/share/thumbnailers/evince.thumbnailer
user@user-X550CL ~/tmp % cat /usr/share/thumbnailers/evince.thumbnailer
[Thumbnailer Entry]
TryExec=evince-thumbnailer
# Exec=evince-thumbnailer -s %s %u %o
MimeType=application/pdf;application/x-bzpdf;application/x-gzpdf;application/x-xzpdf;application/x-ext-pdf;application/postscript;application/x-bzpostscript;application/x-gzpostscript;image/x-eps;image/x-bzeps;image/x-gzeps;application/x-ext-ps;application/x-ext-eps;application/x-dvi;application/x-bzdvi;application/x-gzdvi;application/x-ext-dvi;image/vnd.djvu;application/x-ext-djv;application/x-ext-djvu;image/tiff;application/x-cbr;application/x-cbz;application/x-cb7;application/x-cbt;application/x-ext-cbr;application/x-ext-cbz;application/x-ext-cb7;application/x-ext-cbt;application/oxps;application/vnd.ms-xpsdocument

, Чтобы повторно включить его, не прокомментируйте его снова:

sudo sed -i 's/^# \(Exec=\)/\1/' /usr/share/thumbnailers/evince.thumbnailer

user@user-X550CL ~/tmp % sudo sed -i 's/^# \(Exec=\)/\1/' /usr/share/thumbnailers/evince.thumbnailer
user@user-X550CL ~/tmp % cat /usr/share/thumbnailers/evince.thumbnailer
[Thumbnailer Entry]
TryExec=evince-thumbnailer
Exec=evince-thumbnailer -s %s %u %o
MimeType=application/pdf;application/x-bzpdf;application/x-gzpdf;application/x-xzpdf;application/x-ext-pdf;application/postscript;application/x-bzpostscript;application/x-gzpostscript;image/x-eps;image/x-bzeps;image/x-gzeps;application/x-ext-ps;application/x-ext-eps;application/x-dvi;application/x-bzdvi;application/x-gzdvi;application/x-ext-dvi;image/vnd.djvu;application/x-ext-djv;application/x-ext-djvu;image/tiff;application/x-cbr;application/x-cbz;application/x-cb7;application/x-cbt;application/x-ext-cbr;application/x-ext-cbz;application/x-ext-cb7;application/x-ext-cbt;application/oxps;application/vnd.ms-xpsdocument

Всего sudo apt-get remove evince и окуляр установки. Эта справка мой плохой ThinkPad больше не замораживается.

Ответ Коса - путь. Однако реализация может быть проще. Просто:

cd /usr/share/thumbnailers
sudo nano evince.thumbnailer 
# enter superuser password
# then uncomment the Exec line by entering a # sign as the first character in the line
# exit nano with Ctrl-X, press y, press Enter, DONE!