My Ubuntu14.04 gets stuck in a login loop. i can auto login to desktop as root,but other user gets stuck in a login loop.
(It is a dual-boot system ,windows 7 and Ubuntu14.04)
One day i chmod -R 777 /usr/lib,then i found sudo couldn't use anymore,so i enter recovery mode to fixed the problem
mount -o remount,rw /
sudo chmod 0755 /usr/lib
chmod 4755 /usr/lib/sudo/sudoers.so
Then i found i could not login in anymore.
i add a new file /etc/lightdm/lightdm.conf
the content is:
[SeatDefaults]
autologin-user=root
reboot, i could autologin as root, and could see the default desktop,but when i try to login in as other user ,i just get stuck in a login loop in the login step.
I try to add a new user, still get stuck in a login loop(but i can login in terminal ,also ,i can still use windows system)
i found a web page which might solve my problem ,https://askubuntu.com/questions/223501/ubuntu-gets-stuck-in-a-login-loop#, but i try most of it , it didnt work for me :
1. i try to install/reinstall lightdm and gdm,failed,
2. i try to install Nvidia and AMD/ATI graphics driver,
'sudo apt-get install nvidia-390' and 'sudo apt-get install fglrx',
both failed because 'lib32gcc1 : Depends: gcc-4.9-base (= 4.9-20140406-0ubuntu1) but 4.9.3-0ubuntu1 is to be installed',
I try to install gcc-4.9-base,it shows too many dependence have to install/update
3. sudo apt-get -y install lubuntu-desktop and sudo apt-get -y install lxdm still get login loop
4. chmod for Xauthority /tmp
how can i solve it? Thanks!
ps : There is another clue, the /var/log/cups/error_log grow rapidly ,
the message is
W [01/Aug/2018:00:38:14 +0800] Notifier for subscription 1 (dbus://) went away, retrying!
E [01/Aug/2018:00:38:14 +0800] Directory "/usr/lib/cups/notifier" has insecure permissions (044755/uid=0/gid=0).
and i see memory usage grow too , but could not see witch process use it,why cupsd use 90+% cpu?
Tasks: 186 total, 2 running, 184 sleeping, 0 stopped, 0 zombie
%Cpu(s): 9.4 us, 16.0 sy, 0.0 ni, 74.3 id, 0.3 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 12183948 total, 12031564 used, 152384 free, 3780 buffers
KiB Swap: 4071420 total, 8456 used, 4062964 free. 10761820 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2339 root 20 0 76868 3696 2652 R 99.8 0.0 55:52.53 cupsd
10 root 20 0 0 0 0 S 1.3 0.0 0:19.72 rcuos/2
2519 root 20 0 666088 22280 13220 S 1.0 0.2 0:01.31 gnome-term+
1172 root 20 0 487632 51176 39124 S 0.7 0.4 0:05.67 Xorg
1971 root 20 0 286792 5032 3952 S 0.7 0.0 0:00.08 indicator-+
7 root 20 0 0 0 0 S 0.3 0.0 0:04.42 rcu_sched
(the origin question is about java topic, as i cannot post a new question in stackoverflow, i just reedit the old one)
