login loop: systemd-udevd[713]: failed to execute '/bin/systemctl start --no-block nvidia-persistenced.service': No such file or directory - Ask Ubuntu


my pc working yesterday without problem. shut down , tried open morning. prints out these messages on black screen:

systemd-udevd[713]: failed execute '/bin/systemctl' '/bin/systemctl start --no-block nvidia-persistenced.service': no such file or directory  systemd-udevd[852]: failed execute '/bin/systemctl' '/bin/systemctl stop--no-block nvidia-persistenced': no such file or directory 

it continued login screen. entered password , pressed enter. waited while , login screen reappeared again.

how can fix problem?

in case else has problem, worked me:
press ctrl+alt+f1 open terminal , login.
run sudo apt-get install nvidia-current, sudo reboot
downgraded nvidia-304 , fine after reboot


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