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Cannot open login on SDDM display manager

PostPosted: Jul 14th, '25, 00:50
by laidlaws
This seems a bit spooky. I had been writing about an issue with Java, and had just installed the version from Oracle. Upon rebooting the SDDM Display Manager was no longer working. I could type into it, but upon hitting ENTER, the screen went black for a second or two, then the empty GUI returned. I could reach a console with the F1-F6 keys and type a password, but on trying to enter it, the same thing happened; the lines of text disappeared and I was back at the empty
prompt. I checked the permissions, but I have no idea what to try next.

Re: Cannot open login on SDDM display manager

PostPosted: Jul 14th, '25, 06:57
by benmc
from a tty

output of :

Code: Select all
$ df -h


export it it a file then attach it here

TIA

Re: Cannot open login on SDDM display manager

PostPosted: Jul 14th, '25, 17:35
by laidlaws
Export from Console No. 3 attached.

Code: Select all
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        3.9G     0  3.9G   0% /dev
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           3.9G  1.8M  3.9G   1% /run
/dev/sdb9        95G  8.6G   85G  10% /
efivarfs        256K   60K  192K  24% /sys/firmware/efi/efivars
tmpfs           3.9G  4.0K  3.9G   1% /tmp
/dev/sda3       466G   44G  422G  10% /media/win_c
/dev/sda2        96M   33M   64M  35% /boot/EFI
/dev/sdb8       387G  248G  120G  68% /home
/dev/sdb1       225G   12G  213G   6% /media/win_c2
/dev/sdb5       133G   19G  115G  14% /media/win_d
tmpfs           788M   84K  788M   1% /run/user/972
tmpfs           788M   84K  788M   1% /run/user/0


I forgot to mention that I have the MATE desktop installed as well, and performance was no different

Added code tags. ~Germ

Re: Cannot open login on SDDM display manager

PostPosted: Jul 14th, '25, 20:58
by benmc
Dang.

was thinking you had a nearly full / partition, as your experience is a common symptom.

Have you tried booting to an earlier kernel?

Re: Cannot open login on SDDM display manager

PostPosted: Jul 14th, '25, 22:24
by laidlaws
A problem like that seemed more likely. This was a fresh installation. Windows had put partitions everywhere, and I had tried to squeeze Linux between them. I will try to rearrange them.

Re: Cannot open login on SDDM display manager

PostPosted: Jul 15th, '25, 07:31
by benmc
try the output of

Code: Select all
 $ rpm -qa --last | grep -E "task-mate|task-plasma"

Re: Cannot open login on SDDM display manager

PostPosted: Jul 15th, '25, 17:24
by laidlaws
Windows had overwritten the bootloader so that nothing else would boot. I have found a video, and am at present reinstalling Mageia to put grub2 back. I saw a thread that said that make it permanent using efibootmgr. Windows makes itself the first entry, so accept that, make it unbootable and the bootloader will skip that entry and boot the next one. It works with any OS using UEFI. I had that working well, and lost it on the reinstall. I did have 2 almost full partitions, which made your suggestion applicable. I will try to paste an URL in this thread.