# Advanced contributor tasks These tasks assume that you are already familiar with the more fundamental tasks such as bug fixing and patching. In this section, you will find guides for the more advanced tasks that will support your application for MOTU, Core Dev, etc. ## Checks and investigations * [Check publication history](https://documentation.ubuntu.com/project/contributors/advanced/check-publication-history.md) * [Checking reverse dependencies](https://documentation.ubuntu.com/project/contributors/advanced/check-reverse-dependencies.md) ## Sponsorship and uploading See the [Sponsorship](https://documentation.ubuntu.com/project/how-ubuntu-is-made/processes/sponsorship.md#sponsorship) article series for instructions on how seek sponsorship as well as review and sponsor uploads and syncs. * [Handle git-ubuntu contributions](https://documentation.ubuntu.com/project/contributors/advanced/handle-git-ubuntu-uploads.md) * [Upload with rich history](https://documentation.ubuntu.com/project/contributors/advanced/upload-with-rich-history.md) * [Review a merge proposal](https://documentation.ubuntu.com/project/contributors/advanced/review-a-merge-proposal.md) * [Sponsor an upload](https://documentation.ubuntu.com/project/contributors/advanced/sponsor-an-upload.md) * [Sponsor a sync](https://documentation.ubuntu.com/project/contributors/advanced/sponsor-a-sync.md) ## Proposed migration Guidance on investigating and resolving issues that block automatic migration from the `-proposed` to the `-release `[pocket](https://documentation.ubuntu.com/project/how-ubuntu-is-made/concepts/glossary.md#term-Pocket): * [Resolve a migration issue](https://documentation.ubuntu.com/project/contributors/advanced/resolve-a-migration-issue.md) See the [Proposed migration](https://documentation.ubuntu.com/project/how-ubuntu-is-made/processes/proposed-migration.md#proposed-migration) series of articles for an explanation of the process, as well as a description of common blocking issues. ## Seed management *Content in staging* ## +1 Maintenance The [+1 Maintenance program](https://documentation.ubuntu.com/project/contributors/advanced/plus-one-maintenance.md#plus-one-maintenance) coordinates work towards ensuring the health of the overall Archive for the next release of Ubuntu. * [+1 Maintenance report template](https://documentation.ubuntu.com/project/contributors/advanced/plus-one-report-template.md#plus-one-report-template) ## Requests * [Request a package removal](https://documentation.ubuntu.com/project/contributors/advanced/aa-request-package-removal.md) * [Request a freeze exception](https://documentation.ubuntu.com/project/release-team/request-a-freeze-exception.md) ## Main Inclusion The [Main Inclusion Review (MIR)](https://documentation.ubuntu.com/project/MIR/main-inclusion-review.md#main-inclusion-review) process ensures that both **reporters** and **reviewers** can successfully handle `main` inclusion requests. This improves the long-term maintainability of the packages in `main`. * [MIR bug request template](https://documentation.ubuntu.com/project/MIR/mir-reporters-template.md) * [Use MIR templates](https://documentation.ubuntu.com/project/MIR/mir-how-to-use-templates.md)