今天我注意到,每当我尝试以访客身份登录时,系统都会挂起。这两种情况都会发生——当我尝试在登录屏幕上以访客身份登录时,以及当我单击右上角菜单选项“访客会话”时。
我最近在从 14.04 升级到 15.04 时遇到了一个大问题,这可能很重要——系统完全无法访问,我被迫使用实时 USB 和此处描述的恢复程序:https ://help.ubuntu.com/community/LiveCdRecovery使系统重新启动。
这里可能是什么问题?
编辑:我注意到以访客身份登录的尝试会在系统日志中产生:
Jan 3 15:52:59 marek-GA-990XA-UD3 systemd[1888]: Starting Default.
Jan 3 15:52:59 marek-GA-990XA-UD3 systemd[1]: Started User Manager for UID 132.
Jan 3 15:52:59 marek-GA-990XA-UD3 kernel: [ 17.985371] audit_printk_skb: 39 callbacks suppressed
Jan 3 15:52:59 marek-GA-990XA-UD3 kernel: [ 17.985374] audit: type=1400 audit(1451832779.452:25): apparmor="DENIED" operation="create" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1897 comm="xrdb" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" addr=none
Jan 3 15:52:59 marek-GA-990XA-UD3 kernel: [ 17.998050] audit: type=1400 audit(1451832779.464:26): apparmor="DENIED" operation="create" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1912 comm="id" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" addr=none
Jan 3 15:52:59 marek-GA-990XA-UD3 kernel: [ 17.998057] audit: type=1400 audit(1451832779.464:27): apparmor="DENIED" operation="create" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1912 comm="id" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" addr=none
Jan 3 15:52:59 marek-GA-990XA-UD3 kernel: [ 17.999409] audit: type=1400 audit(1451832779.464:28): apparmor="DENIED" operation="create" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1913 comm="xhost" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" addr=none
Jan 3 15:52:59 marek-GA-990XA-UD3 kernel: [ 18.003125] audit: type=1400 audit(1451832779.468:29): apparmor="DENIED" operation="create" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1916 comm="unity_support_t" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" addr=none
Jan 3 15:52:59 marek-GA-990XA-UD3 kernel: [ 18.007685] audit: type=1400 audit(1451832779.472:30): apparmor="DENIED" operation="create" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1921 comm="id" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" addr=none
Jan 3 15:52:59 marek-GA-990XA-UD3 kernel: [ 18.007693] audit: type=1400 audit(1451832779.472:31): apparmor="DENIED" operation="create" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1921 comm="id" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" addr=none
Jan 3 15:52:59 marek-GA-990XA-UD3 kernel: [ 18.009047] audit: type=1400 audit(1451832779.476:32): apparmor="DENIED" operation="create" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1922 comm="xhost" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" addr=none
Jan 3 15:52:59 marek-GA-990XA-UD3 kernel: [ 18.013074] audit: type=1400 audit(1451832779.480:33): apparmor="DENIED" operation="create" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1927 comm="xdg-user-dirs-u" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" addr=none
Jan 3 15:52:59 marek-GA-990XA-UD3 kernel: [ 18.013081] audit: type=1400 audit(1451832779.480:34): apparmor="DENIED" operation="create" profile="/usr/lib/lightdm/lightdm-guest-session" pid=1927 comm="xdg-user-dirs-u" family="unix" sock_type="stream" protocol=0 requested_mask="create" denied_mask="create" addr=none
很可能是 lightdm-guest-session 文件
已损坏或被删除。应该有一个名为 lightdm-guest-session 的文件,没有扩展名,里面有以下内容:
带有#include 的行不是注释,而是必需的!