Package: dpkg Version: 1.19.6 Severity: normal Scenario
$ dpkg -l firefox ... ii firefox 67.0~b18-0 amd64 Mozilla Firefox web browser $ sudo dpkg --refuse-downgrade -i firefox_66.0.4-1_amd64.deb dpkg: will not downgrade firefox from 67.0~b18-0 to 66.0.4-1, skipping This is expected behaviour. Now but --refuse-downgrade into a config file. $ grep -r downgrade /etc/dpkg /etc/dpkg/dpkg.cfg:refuse-downgrade Try again: $ sudo dpkg -i firefox_66.0.4-1_amd64.deb dpkg: warning: downgrading firefox from 67.0~b18-0 to 66.0.4-1 (Reading database ... 262020 files and directories currently installed.) Preparing to unpack firefox_66.0.4-1_amd64.deb ... Unpacking firefox (66.0.4-1) over (67.0~b18-0) ... Setting up firefox (66.0.4-1) ... dpkg should have refused as before. -- Package-specific info: -- System Information: Debian Release: 10.0 APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental') Architecture: amd64 (x86_64) Kernel: Linux 5.0.0-trunk-amd64 (SMP w/4 CPU cores) Kernel taint flags: TAINT_UNSIGNED_MODULE Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages dpkg depends on: ii libbz2-1.0 1.0.6-9 ii libc6 2.28-10 ii liblzma5 5.2.4-1 ii libselinux1 2.8-1+b1 ii tar 1.30+dfsg-6 ii zlib1g 1:1.2.11.dfsg-1 dpkg recommends no packages. Versions of packages dpkg suggests: ii apt 1.8.1 pn debsig-verify <none> -- Configuration Files: /etc/dpkg/dpkg.cfg changed: no-debsig log /var/log/dpkg.log refuse-downgrade -- no debconf information
