... LPIC-1Linux Professional Institute CertificationStudy GuideSecond Edition 04836book.indd 1 1/16/09 9:34:31 AM04836book.indd 10 1/16/09 9:34:33 AM60 Chapter 2 ... be trusted. The apt-get utility does automatic and semiautomatic upgrades, so if you add a network source to sources.list and that source contains unreliable programs or programs with ... dselect-upgrade, install, remove, sourceIgnores all package files that can’t be retrieved (because of network errors, missing files, or the like).-q or quietAll Omits some progress indi-cator...