When an exact version is specified, an implicit priority of 1001 is used. When default_release is used, an implicit priority of 990 is used. When used with a loop: each package will be processed individually, it is much more efficient to pass the list directly to the name option. Since we don’t have warnings and prompts before installing we disallow this.Use an explicit fnmatch pattern if you want wildcarding) The apt-get commandline supports implicit regex matches here but we do not because it can let typos through easier (If you typo foo as fo apt-get would install packages that have “fo” in their name with a warning and a prompt for the user. Remove the file or remove its execute permission afterwards. For example when installing Postgresql-9.5 in Debian 9, creating an excutable shell script (/usr/sbin/policy-rc.d) that throws a return code of 101 will stop Postgresql 9.5 starting up after install. Most distributions have mechanisms to avoid this. In most cases, packages installed with apt will start newly installed services by default. Three of the upgrade modes ( full, safe and its alias true) required aptitude up to 2.3, since 2.4 apt-get is used as a fall-back.
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