I want to create a bibliography for a thesis but I can't download the related Libreoffice tool because the necessary package is untrusted for my computer. Each time I try I get the following error message:
libreoffice-base libreoffice-base-drivers libreoffice-sdbc-firebird libreoffice-sdbc-hsqldb
Here is a pic of the situation:
Can you help me download it or find an alternative solution?