You can use the cron daemon to schedule the execution of a bash script on Ubuntu. To run a bash script "script.sh" every Thursday on odd days and odd months, follow these steps:

Open your terminal and type the following command to open the crontab file:
    >crontab -e
This will open the crontab file in the default text editor. Add the following line to the end of the file:
    >0 0 * * 4 [ $(( $(date +\%d) \% 2)) -eq 1 ] && [ $(( $(date +\%m) \% 2)) -eq 1 ] && /path/to/script.sh
``Replace `/path/to/script.sh` with the actual path to your bash script.``

Save the file and exit the editor.
This cron job will run the script every Thursday at midnight (0 0 * * 4), and will only execute the script if the day of the month and the month are odd numbers.

Note: Make sure the script has executable permission (use chmod +x script.sh to grant executable permission) and that the path to the script is correct.
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