我想尝试新的 PostgreSQL 并按照此说明进行操作。但是安装失败：
$ sudo apt install postgresql-client-13
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
postgresql-client-13 : Depends: libpq5 (>= …我刚刚安装了 Mint 19(Tara)，并尝试使用安装 Ruby2.3.8并rbenv收到此错误。任何人都可以帮助我解决这个问题吗？
$ rbenv install 2.3.8 1 \xe2\x86\xb5\nDownloading ruby-2.3.8.tar.bz2...\n-> https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.8.tar.bz2\nInstalling ruby-2.3.8...\n\nWARNING: ruby-2.3.8 is past its end of life and is now unsupported.\nIt no longer receives bug fixes or critical security updates.\n\n\nBUILD FAILED (LinuxMint 19 using ruby-build 20200401-11-g12af1c3)\n\nInspect or clean up the working tree at /tmp/ruby-build.20200519084931.6743.ptWQ7b\nResults logged to /tmp/ruby-build.20200519084931.6743.log\n\nLast 10 log lines:\n../../internal.h:84:30: warning: this use of "defined" may not be portable [-Wexpansion-to-defined]\nlinking shared-object json/ext/generator.so\nmake[2]: Leaving directory \'/tmp/ruby-build.20200519084931.6743.ptWQ7b/ruby-2.3.8/ext/json/generator\'\nlinking shared-object objspace.so\nmake[2]: Leaving directory \'/tmp/ruby-build.20200519084931.6743.ptWQ7b/ruby-2.3.8/ext/objspace\'\nlinking shared-object nkf.so\nmake[2]: …我想将我的 php 版本从 8 降级到 7.4，所以我添加了 php repo，sudo add-apt-repository ppa:ondrej/php
但是当我运行时， sudo apt update我收到 Insomnia repo 的错误
Err:16 https://dl.bintray.com/getinsomnia/Insomnia InRelease
403 Forbidden [IP: 52.35.132.179 443]
Reading package lists... Done
E: Failed to fetch https://dl.bintray.com/getinsomnia/Insomnia/InRelease 403 Forbidden [IP: 52.35.132.179 443]
E: The repository 'https://dl.bintray.com/getinsomnia/Insomnia InRelease' is no longer signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
我感谢任何人都可以帮助我，因为我还是 Linux 新手