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This topic created in 145 days ago, the information mentioned may be changed or developed.
debian 13 trixie 新安装系统，当前用户为 root 的情况下无法 login 到普通用户，终端会直接断开，甚至到不了输入密码这一步。ssh 的情况下会断开连接 journalctl -xe 也看不什么有用到信息。
未登录的情况下，可以直接登录为普通用户。在 ubuntu noble 系统下就没这问题。
例如，当前是 root 用户:
login <user> #终端挂掉
su --login <user> #不要求密码直接切换
sudo -i -u <user> #不要求密码直接切换
 | 1 wu67 Dec 2, 2025 我记得是一开始是 admin 登进去, sudo -s 切 root. 用完 exit 回车 返回 admin. 再 exit 回车 断开 ssh 链接. |
 | 2 nlzy Dec 2, 2025  3 Debian 13 把 /usr/bin/login 的实现从 shadow-utils 换成 util-linux 了，后者的手册里有一句话： If one uses the command login, then the surrounding shell gets killed by vhangup(2) because it’s no longer the true owner of the tty. This can be avoided by using `exec login` in a top-level shell or xterm. |
 | 3 chinni Dec 2, 2025 machinectl shell <user>@ |
 | 4 Earthman OP 以前查过 release notes ，没写到这点。搜索也不易找到。 用这样的关键词才找到一点 "debian 13 login shadow-utils util-linux" 结果有条 Debian Trixie: Nested Logins Always Failing https://lists.debian.org/debian-user/2025/10/msg00183.html 测试过了，没法登录到其他用户，这么重要的 breaking change 居然没有记录 |
| 5 Earthman OP 找到了更多信息 A recursive login, as used to be possible in the good old days, no longer works; for most purposes [su]( https://manpages.ubuntu.com/manpages/plucky/man1/su.1.html) is a satisfactory substitute. Indeed, for security reasons, login does a [vhangup]( https://manpages.ubuntu.com/manpages/plucky/man2/vhangup.2.html) system call to remove any possible listening processes on the tty. This is to avoid password sniffing. If one uses the command login, then the surrounding shell gets killed by [vhangup]( https://manpages.ubuntu.com/manpages/plucky/man2/vhangup.2.html) because it’s no longer the true owner of the tty. This can be avoided by using exec login in a top-level shell or xterm. |
| 6 Earthman OP |
 | 7 iamwin Dec 3, 2025 su username 不行吗？从来没遇到过你这种情况 |
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