Eu tinha o Ubuntu instalado e queria remover o Python 3. Eu removi acidentalmente cada versão do Python instalada porque eu não sabia que o Ubuntu Desktop precisava do Python para ser executado. Eu tive que reinstalar o Ubuntu completamente (eu quase não tinha arquivos). Mas agora, após o boot, meu PC fica preso na tela roxa. Eu forço a desligar e inicializo o backup. Aparece a tela com Memtest e Advanced Options, seleciono o Ubuntu e, em seguida, ele verifica brevemente alguns blocos e inicializa como esperado. Eu não quero passar por este procedimento a cada momento. Você tem alguma idéia do que poderia causar esses problemas? É um problema com o GRUB? Eu tenho uma torre Dell Inspiron 5300.
ATUALIZAÇÃO:
Este é o meu arquivo lightdm.log :
[+0.02s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.02s] DEBUG: Starting Light Display Manager 1.16.4, UID=0 PID=650
[+0.02s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
[+0.02s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
[+0.02s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
[+0.02s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf
[+0.02s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf
[+0.02s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
[+0.02s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
[+0.02s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.02s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.02s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.02s] DEBUG: Registered seat module xlocal
[+0.02s] DEBUG: Registered seat module xremote
[+0.02s] DEBUG: Registered seat module unity
[+0.03s] DEBUG: Monitoring logind for seats
[+0.03s] DEBUG: New seat added from logind: seat0
[+0.03s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.03s] DEBUG: Seat seat0: Starting
[+0.03s] DEBUG: Seat seat0: Creating user session
[+0.03s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.03s] DEBUG: User /org/freedesktop/Accounts/User1000 added
[+0.08s] DEBUG: Seat seat0: Creating display server of type x
[+0.09s] DEBUG: Deactivating Plymouth
[+0.11s] DEBUG: Using VT 7
[+0.11s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.11s] DEBUG: DisplayServer x-0: Logging to /var/log/lightdm/x-0.log
[+0.11s] DEBUG: DisplayServer x-0: Writing X server authority to /var/run/lightdm/root/:0
[+0.11s] DEBUG: DisplayServer x-0: Launching X Server
[+0.11s] DEBUG: Launching process 662: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -n$
[+0.11s] DEBUG: DisplayServer x-0: Waiting for ready signal from X server :0
[+0.11s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.11s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.55s] DEBUG: Got signal 10 from process 662
[+0.55s] DEBUG: DisplayServer x-0: Got signal from X server :0
[+0.55s] DEBUG: DisplayServer x-0: Connecting to XServer :0
[+0.55s] DEBUG: Quitting Plymouth; retaining splash
[+0.57s] DEBUG: Seat seat0: Display server ready, starting session authentication
[+0.57s] DEBUG: Session pid=669: Started with service 'lightdm-autologin', username 'steve'
[+0.60s] DEBUG: Session pid=669: Authentication complete with return value 0: Success
[+0.60s] DEBUG: Seat seat0: Session authenticated, running command
[+0.60s] DEBUG: Registering session with bus path /org/freedesktop/DisplayManage/Session0
[+0.61s] DEBUG: Session pid=669: Running command /usr/sbin/lightdm-session gnome-session --session=ubuntu
[+0.61s] DEBUG: Creating shared data directory /var/lib/lightdm-data/steve
[+0.61s] DEBUG: Session pid=669: Logging to .xsession-errors
[+0.84s] DEBUG: Activating VT 7
[+0.84s] DEBUG: Activating login1 session c1
[+0.84s] DEBUG: Seat seat0 changes active session to c1
[+0.84s] DEBUG: Session c1 is already active
E este é o meu arquivo x-o.log :
X.Org X Server 1.17.2
Release Date: 2015-06-16
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.19.0-30-generic x86_64 Ubuntu
Current Operating System: Linux ubuntu-x64-steve 4.2.0-16-generic #19-Ubuntu SMP Thu Oct 8 15:35:06 UTC 2015 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=1ce2943d-991b-4263-9d84-34617abe91f1 ro quiet splash
Build Date: 30 September 2015 09:08:47AM
xorg-server 2:1.17.2-1ubuntu9 (For technical support please see http://www.ubuntu.com/support)
Current version of pixman: 0.32.6
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue Nov 3 17:13:09 2015
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
Eu sei que é meio confuso, mas eu não sabia como fazer isso melhor.
Há também .old.log versões desses arquivos que você precisa?