问题描述
我在笔记本电脑中安装了一个全新的SSD，并全新安装了Ubuntu 15.04，没有使用系统加密(仅使用主目录加密)。但是，它在引导时仍然要求我输入密码(我只按Enter即可跳过)：
此外，在执行全新安装后，升级程序包还会多次询问我密码，Enter也会绕过该密码。该程序是”systemd-tty-ask-password-agent”，所以问题似乎出在systemd上。
终端中的相关消息：
Please enter passphrase for disk Crucial_CT250MX200SSD4 (cryptswap1) on none!
update-initramfs: deferring update (trigger activated)
Broadcast message from root@username-XPS-13-9343 (Thu 2015-04-30 22:06:22 EDT):
Password entry required for 'Please enter passphrase for disk Crucial_CT250MX200SSD4 (cryptswap1) on none!' (PID 4027).
Please enter password with the systemd-tty-ask-password-agent tool!
运行升级的完整输出：
+username@username-XPS-13-9343:~$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
ca-certificates firefox gir1.2-gudev-1.0 libcurl3 libcurl3-gnutls
libgudev-1.0-0 libnm-glib-vpn1 libnm-glib4 libnm-util2 liboxideqt-qmlplugin
liboxideqtcore0 liboxideqtquick0 libpam-systemd libsystemd0 libudev1
network-manager oxideqt-codecs systemd systemd-sysv tzdata udev
usb-creator-common usb-creator-gtk wpasupplicant
24 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 47.9 MB/73.2 MB of archives.
After this operation, 2,989 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Get:1 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main libudev1 amd64 219-7ubuntu4 [40.8 kB]
Get:2 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main udev amd64 219-7ubuntu4 [929 kB]
Get:3 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main systemd-sysv amd64 219-7ubuntu4 [14.0 kB]
Get:4 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main libpam-systemd amd64 219-7ubuntu4 [108 kB]
Get:5 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main libsystemd0 amd64 219-7ubuntu4 [73.8 kB]
Get:6 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main systemd amd64 219-7ubuntu4 [3,531 kB]
Get:7 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main libcurl3-gnutls amd64 7.38.0-3ubuntu2.2 [172 kB]
Get:8 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main libcurl3 amd64 7.38.0-3ubuntu2.2 [180 kB]
Get:9 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main libgudev-1.0-0 amd64 1:219-7ubuntu4 [14.4 kB]
Get:10 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main libnm-util2 amd64 0.9.10.0-4ubuntu15.1 [134 kB]
Get:11 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main libnm-glib-vpn1 amd64 0.9.10.0-4ubuntu15.1 [14.4 kB]
Get:12 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main libnm-glib4 amd64 0.9.10.0-4ubuntu15.1 [84.7 kB]
Get:13 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main tzdata all 2015d-0ubuntu0.15.04 [178 kB]
Get:14 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main ca-certificates all 20141019ubuntu0.15.04.1 [191 kB]
Get:15 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main firefox amd64 37.0.2+build1-0ubuntu0.15.04.1 [40.1 MB]
Get:16 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main gir1.2-gudev-1.0 amd64 1:219-7ubuntu4 [5,564 B]
Get:17 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main wpasupplicant amd64 2.1-0ubuntu7.1 [768 kB]
Get:18 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main network-manager amd64 0.9.10.0-4ubuntu15.1 [754 kB]
Get:19 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main usb-creator-gtk amd64 0.2.67ubuntu0.1 [23.4 kB]
Get:20 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main usb-creator-common amd64 0.2.67ubuntu0.1 [23.7 kB]
Get:21 http://us.archive.ubuntu.com/ubuntu/ vivid-updates/main oxideqt-codecs amd64 1.6.5-0ubuntu0.15.04.1 [533 kB]
Fetched 47.9 MB in 1min 18s (613 kB/s)
Preconfiguring packages ...
(Reading database ... 171469 files and directories currently installed.)
Preparing to unpack .../libudev1_219-7ubuntu4_amd64.deb ...
Unpacking libudev1:amd64 (219-7ubuntu4) over (219-7ubuntu3) ...
Setting up libudev1:amd64 (219-7ubuntu4) ...
Processing triggers for libc-bin (2.21-0ubuntu4) ...
(Reading database ... 171469 files and directories currently installed.)
Preparing to unpack .../udev_219-7ubuntu4_amd64.deb ...
Unpacking udev (219-7ubuntu4) over (219-7ubuntu3) ...
Processing triggers for man-db (2.7.0.2-5) ...
Processing triggers for ureadahead (0.100.0-19) ...
ureadahead will be reprofiled on next reboot
Processing triggers for systemd (219-7ubuntu3) ...
Setting up udev (219-7ubuntu4) ...
Please enter passphrase for disk Crucial_CT250MX200SSD4 (cryptswap1) on none!
update-initramfs: deferring update (trigger activated)
Broadcast message from root@username-XPS-13-9343 (Thu 2015-04-30 22:06:22 EDT):
Password entry required for 'Please enter passphrase for disk Crucial_CT250MX200SSD4 (cryptswap1) on none!' (PID 4027).
Please enter password with the systemd-tty-ask-password-agent tool!
Processing triggers for initramfs-tools (0.103ubuntu15) ...
update-initramfs: Generating /boot/initrd.img-3.19.0-15-generic
(Reading database ... 171469 files and directories currently installed.)
Preparing to unpack .../systemd-sysv_219-7ubuntu4_amd64.deb ...
Unpacking systemd-sysv (219-7ubuntu4) over (219-7ubuntu3) ...
Processing triggers for man-db (2.7.0.2-5) ...
Setting up systemd-sysv (219-7ubuntu4) ...
(Reading database ... 171469 files and directories currently installed.)
Preparing to unpack .../libpam-systemd_219-7ubuntu4_amd64.deb ...
Unpacking libpam-systemd:amd64 (219-7ubuntu4) over (219-7ubuntu3) ...
Preparing to unpack .../libsystemd0_219-7ubuntu4_amd64.deb ...
Unpacking libsystemd0:amd64 (219-7ubuntu4) over (219-7ubuntu3) ...
Processing triggers for man-db (2.7.0.2-5) ...
Setting up libsystemd0:amd64 (219-7ubuntu4) ...
Processing triggers for libc-bin (2.21-0ubuntu4) ...
(Reading database ... 171469 files and directories currently installed.)
Preparing to unpack .../systemd_219-7ubuntu4_amd64.deb ...
Unpacking systemd (219-7ubuntu4) over (219-7ubuntu3) ...
Processing triggers for dbus (1.8.12-1ubuntu5) ...
Processing triggers for man-db (2.7.0.2-5) ...
Processing triggers for ureadahead (0.100.0-19) ...
Setting up systemd (219-7ubuntu4) ...
Please enter passphrase for disk Crucial_CT250MX200SSD4 (cryptswap1) on none!
(Reading database ... 171469 files and directories currently installed.)
Preparing to unpack .../libcurl3-gnutls_7.38.0-3ubuntu2.2_amd64.deb ...
Unpacking libcurl3-gnutls:amd64 (7.38.0-3ubuntu2.2) over (7.38.0-3ubuntu2) ...
Preparing to unpack .../libcurl3_7.38.0-3ubuntu2.2_amd64.deb ...
Unpacking libcurl3:amd64 (7.38.0-3ubuntu2.2) over (7.38.0-3ubuntu2) ...
Preparing to unpack .../libgudev-1.0-0_1%3a219-7ubuntu4_amd64.deb ...
Unpacking libgudev-1.0-0:amd64 (1:219-7ubuntu4) over (1:219-7ubuntu3) ...
Preparing to unpack .../libnm-util2_0.9.10.0-4ubuntu15.1_amd64.deb ...
Unpacking libnm-util2:amd64 (0.9.10.0-4ubuntu15.1) over (0.9.10.0-4ubuntu15) ...
Preparing to unpack .../libnm-glib-vpn1_0.9.10.0-4ubuntu15.1_amd64.deb ...
Unpacking libnm-glib-vpn1:amd64 (0.9.10.0-4ubuntu15.1) over (0.9.10.0-4ubuntu15) ...
Preparing to unpack .../libnm-glib4_0.9.10.0-4ubuntu15.1_amd64.deb ...
Unpacking libnm-glib4:amd64 (0.9.10.0-4ubuntu15.1) over (0.9.10.0-4ubuntu15) ...
Preparing to unpack .../tzdata_2015d-0ubuntu0.15.04_all.deb ...
Unpacking tzdata (2015d-0ubuntu0.15.04) over (2015c-1) ...
Setting up tzdata (2015d-0ubuntu0.15.04) ...
Current default time zone: 'America/New_York'
Local time is now: Thu Apr 30 22:20:06 EDT 2015.
Universal Time is now: Fri May 1 02:20:06 UTC 2015.
Run 'dpkg-reconfigure tzdata' if you wish to change it.
(Reading database ... 171469 files and directories currently installed.)
Preparing to unpack .../ca-certificates_20141019ubuntu0.15.04.1_all.deb ...
Unpacking ca-certificates (20141019ubuntu0.15.04.1) over (20141019) ...
Preparing to unpack .../firefox_37.0.2+build1-0ubuntu0.15.04.1_amd64.deb ...
Unpacking firefox (37.0.2+build1-0ubuntu0.15.04.1) over (37.0+build2-0ubuntu1) ...
Preparing to unpack .../gir1.2-gudev-1.0_1%3a219-7ubuntu4_amd64.deb ...
Unpacking gir1.2-gudev-1.0 (1:219-7ubuntu4) over (1:219-7ubuntu3) ...
Preparing to unpack .../wpasupplicant_2.1-0ubuntu7.1_amd64.deb ...
Unpacking wpasupplicant (2.1-0ubuntu7.1) over (2.1-0ubuntu7) ...
Preparing to unpack .../network-manager_0.9.10.0-4ubuntu15.1_amd64.deb ...
Unpacking network-manager (0.9.10.0-4ubuntu15.1) over (0.9.10.0-4ubuntu15) ...
Broadcast message from root@username-XPS-13-9343 (Thu 2015-04-30 22:20:19 EDT):
Password entry required for 'Please enter passphrase for disk Crucial_CT250MX200SSD4 (cryptswap1) on none!' (PID 15391).
Please enter password with the systemd-tty-ask-password-agent tool!
Preparing to unpack .../usb-creator-gtk_0.2.67ubuntu0.1_amd64.deb ...
Unpacking usb-creator-gtk (0.2.67ubuntu0.1) over (0.2.67) ...
Preparing to unpack .../usb-creator-common_0.2.67ubuntu0.1_amd64.deb ...
Unpacking usb-creator-common (0.2.67ubuntu0.1) over (0.2.67) ...
Preparing to unpack .../liboxideqt-qmlplugin_1.6.5-0ubuntu0.15.04.1_amd64.deb ...
Unpacking liboxideqt-qmlplugin:amd64 (1.6.5-0ubuntu0.15.04.1) over (1.5.5-0ubuntu1) ...
Preparing to unpack .../liboxideqtquick0_1.6.5-0ubuntu0.15.04.1_amd64.deb ...
Unpacking liboxideqtquick0:amd64 (1.6.5-0ubuntu0.15.04.1) over (1.5.5-0ubuntu1) ...
Preparing to unpack .../liboxideqtcore0_1.6.5-0ubuntu0.15.04.1_amd64.deb ...
Unpacking liboxideqtcore0:amd64 (1.6.5-0ubuntu0.15.04.1) over (1.5.5-0ubuntu1) ...
Preparing to unpack .../oxideqt-codecs_1.6.5-0ubuntu0.15.04.1_amd64.deb ...
Unpacking oxideqt-codecs:amd64 (1.6.5-0ubuntu0.15.04.1) over (1.5.5-0ubuntu1) ...
Processing triggers for man-db (2.7.0.2-5) ...
Processing triggers for gnome-menus (3.10.1-0ubuntu5) ...
Processing triggers for desktop-file-utils (0.22-1ubuntu3) ...
Processing triggers for bamfdaemon (0.5.1+15.04.20150202-0ubuntu1) ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for mime-support (3.58ubuntu1) ...
Processing triggers for dbus (1.8.12-1ubuntu5) ...
Processing triggers for systemd (219-7ubuntu4) ...
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for hicolor-icon-theme (0.14-0ubuntu1) ...
Setting up libpam-systemd:amd64 (219-7ubuntu4) ...
Setting up libcurl3-gnutls:amd64 (7.38.0-3ubuntu2.2) ...
Setting up libcurl3:amd64 (7.38.0-3ubuntu2.2) ...
Setting up libgudev-1.0-0:amd64 (1:219-7ubuntu4) ...
Setting up libnm-util2:amd64 (0.9.10.0-4ubuntu15.1) ...
Setting up libnm-glib-vpn1:amd64 (0.9.10.0-4ubuntu15.1) ...
Setting up libnm-glib4:amd64 (0.9.10.0-4ubuntu15.1) ...
Setting up ca-certificates (20141019ubuntu0.15.04.1) ...
Setting up firefox (37.0.2+build1-0ubuntu0.15.04.1) ...
Please restart all running instances of firefox, or you will experience problems.
Setting up gir1.2-gudev-1.0 (1:219-7ubuntu4) ...
Setting up wpasupplicant (2.1-0ubuntu7.1) ...
Setting up network-manager (0.9.10.0-4ubuntu15.1) ...
Please enter passphrase for disk Crucial_CT250MX200SSD4 (cryptswap1) on none!
Broadcast message from root@username-XPS-13-9343 (Thu 2015-04-30 22:20:47 EDT):
Password entry required for 'Please enter passphrase for disk Crucial_CT250MX200SSD4 (cryptswap1) on none!' (PID 19822).
Please enter password with the systemd-tty-ask-password-agent tool!
Please enter passphrase for disk Crucial_CT250MX200SSD4 (cryptswap1) on none!
Setting up usb-creator-common (0.2.67ubuntu0.1) ...
Setting up usb-creator-gtk (0.2.67ubuntu0.1) ...
Setting up oxideqt-codecs:amd64 (1.6.5-0ubuntu0.15.04.1) ...
Setting up liboxideqtcore0:amd64 (1.6.5-0ubuntu0.15.04.1) ...
Setting up liboxideqtquick0:amd64 (1.6.5-0ubuntu0.15.04.1) ...
Setting up liboxideqt-qmlplugin:amd64 (1.6.5-0ubuntu0.15.04.1) ...
Processing triggers for libc-bin (2.21-0ubuntu4) ...
Processing triggers for ca-certificates (20141019ubuntu0.15.04.1) ...
Updating certificates in /etc/ssl/certs... 0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d....done.
username@username-XPS-13-9343:~$
有人发布了类似的问题here，但这似乎与我未使用的OpenVPN有关。反正我没有/etc/default/openvpn文件。
如何解决此问题？
最佳思路
这是一个已知问题，应尽快解决：
https://bugs.launchpad.net/ubuntu/+source/ecryptfs-utils/+bug/1447282
简而言之：在某些情况下，systemd无法正确识别加密的交换，并提示输入从未设置的密码。交换总是加密的，以防激活家庭加密，因为用户数据可能会被交换出来，然后变得未加密。
次佳思路
这不是正确的解决方案，正如克里斯蒂安在下面的评论中说的那样，这会使它的安全性降低。但是，如果加密不是您的优先事项，则可以使用此替代方法。
首先找到具有交换的分区
sudo fdisk -l
[sudo] password for kempe:
Disk /dev/sda: 233,8 GiB, 251000193024 bytes, 490234752 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: B59D4149-AC8E-4B71-B51F-8926B2E82C14
Device Start End Sectors Size Type
/dev/sda1 2048 409599 407552 199M EFI System
/dev/sda2 409640 253319775 252910136 120,6G Apple HFS/HFS+
/dev/sda3 253321216 269320191 15998976 7,6G Linux swap
/dev/sda4 269320192 490233855 220913664 105,3G Linux filesystem
就我而言，交换位于/dev/sda3
然后关闭交换
sudo swapoff -a
禁用cryptswap
sudo cryptsetup remove /dev/mapper/cryptswap1
删除/etc /crypttab中的相应行。我那里只有一行，但您可能还有更多，因此请确保删除正确的行
sudo vim /etc/crypttab
设置新的交换区(记住fstab输出)
sudo /sbin/mkswap /dev/sda3
sudo swapon /dev/sda3
最后修复fstab行
sudo vim /etc/fstab
将/dev/mapper/cryptswap1替换为/dev/sda3
Enable and disable encrypted swap – Ubuntu
第三种思路
我可以通过以下步骤解决此问题：
在命令提示符下，运行gnome-disks
查找哪个设备是您的交换驱动器。我的是/dev/sda3
ls -l /dev/disk/by-uuid/
查找与交换分区符号链接的ID
sudo vim /etc/crypttab
在以cryptswap1开头的行上，将UUID =…部分更改为/dev /disk /by-id /ID-HERE。保存并重新启动。
如果仍然提示您输入密码，请运行：
sudo dd if=/dev/zero of=/dev/sdaX bs=512 count=20480
重新启动。