My setup is ubuntu 18.04 version OS.
I’ve created backup based on documentation and restore same way that documentation followed.
Gitea version 1.11.3
Command I used for restore
sqlite3 /var/lib/gitea/data/gitea.db <gitea-db.sql
Error: near line 4: index IDX_user_last_login_unix already exists
Error: near line 5: index IDX_user_is_active already exists
Error: near line 6: index UQE_user_lower_name already exists
Error: near line 7: index UQE_user_name already exists
Error: near line 8: index IDX_user_created_unix already exists
Error: near line 9: index IDX_user_updated_unix already exists
Error: near line 10: no such column: false
Error: near line 13: index IDX_public_key_fingerprint already exists
Error: near line 14: index IDX_public_key_owner_id already exists
Error: near line 18: index IDX_access_token_uid already exists
Error: near line 19: index UQE_access_token_token_hash already exists
Error: near line 20: index IDX_access_token_created_unix already exists
Error: near line 21: index IDX_access_token_updated_unix already exists
Error: near line 24: index IDX_repository_is_fork already exists
Error: near line 25: index IDX_repository_fork_id already exists
Error: near line 26: index IDX_repository_template_id already exists
Error: near line 27: index UQE_repository_s already exists
Error: near line 28: index IDX_repository_is_template already exists
Error: near line 29: index IDX_repository_is_archived already exists
Error: near line 30: index IDX_repository_is_empty already exists
Error: near line 31: index IDX_repository_is_mirror already exists
Error: near line 32: index IDX_repository_updated_unix already exists
Error: near line 33: index IDX_repository_name already exists
Error: near line 34: index IDX_repository_lower_name already exists
Error: near line 35: index IDX_repository_original_service_type already exists
Error: near line 36: index IDX_repository_is_private already exists
Error: near line 37: index IDX_repository_created_unix already exists
Error: near line 38: index IDX_repository_owner_id already exists
Error: near line 39: no such column: false
Error: near line 40: no such column: false
Error: near line 43: index UQE_deploy_key_s already exists
Error: near line 44: index IDX_deploy_key_key_id already exists
Error: near line 45: index IDX_deploy_key_repo_id already exists
Error: near line 48: index IDX_collaboration_user_id already exists
Error: near line 49: index UQE_collaboration_s already exists
Error: near line 50: index IDX_collaboration_repo_id already exists
Error: near line 53: index UQE_access_s already exists
Error: near line 56: index UQE_upload_uuid already exists
Error: near line 59: index UQE_watch_watch already exists
Error: near line 64: index UQE_star_s already exists
Error: near line 67: index UQE_follow_follow already exists
Error: near line 70: index IDX_action_user_id already exists
Error: near line 71: index IDX_action_act_user_id already exists
Error: near line 72: index IDX_action_repo_id already exists
Error: near line 73: index IDX_action_comment_id already exists
Error: near line 74: index IDX_action_is_deleted already exists
Error: near line 75: index IDX_action_is_private already exists
Error: near line 76: index IDX_action_created_unix already exists
Error: near line 77: no such column: false
Error: near line 78: no such column: false
Error: near line 79: no such column: false
Error: near line 80: no such column: false
Error: near line 81: no such column: false
Error: near line 82: no such column: false
Error: near line 83: no such column: false
Error: near line 84: no such column: false
Error: near line 85: no such column: false
Error: near line 86: no such column: false
Error: near line 89: index IDX_issue_deadline_unix already exists
Error: near line 90: index IDX_issue_created_unix already exists
Error: near line 91: index IDX_issue_updated_unix already exists
Error: near line 92: index IDX_issue_closed_unix already exists
Error: near line 93: index IDX_issue_repo_id already exists
Error: near line 94: index IDX_issue_poster_id already exists
Error: near line 95: index IDX_issue_is_closed already exists
Error: near line 96: index IDX_issue_is_pull already exists
Error: near line 97: index UQE_issue_repo_index already exists
Error: near line 98: index IDX_issue_original_author_id already exists
Error: near line 99: index IDX_issue_milestone_id already exists
Error: near line 100: no such column: false
Error: near line 103: index IDX_pull_request_issue_id already exists
Error: near line 104: index IDX_pull_request_head_repo_id already exists
Error: near line 105: index IDX_pull_request_base_repo_id already exists
Error: near line 106: index IDX_pull_request_has_merged already exists
Error: near line 107: index IDX_pull_request_merger_id already exists
Error: near line 108: index IDX_pull_request_merged_unix already exists
Error: near line 111: index IDX_comment_review_id already exists
Error: near line 112: index IDX_comment_ref_issue_id already exists
Error: near line 113: index IDX_comment_ref_comment_id already exists
Error: near line 114: index IDX_comment_updated_unix already exists
Error: near line 115: index IDX_comment_poster_id already exists
Error: near line 116: index IDX_comment_issue_id already exists
Error: near line 117: index IDX_comment_created_unix already exists
Error: near line 118: index IDX_comment_ref_repo_id already exists
Error: near line 119: index IDX_comment_type already exists
Error: near line 122: index UQE_attachment_uuid already exists
Error: near line 123: index IDX_attachment_issue_id already exists
Error: near line 124: index IDX_attachment_release_id already exists
Error: near line 125: index IDX_attachment_uploader_id already exists
Error: near line 128: index IDX_label_repo_id already exists
Error: near line 131: index UQE_issue_label_s already exists
Error: near line 134: index IDX_milestone_repo_id already exists
Error: near line 137: index IDX_mirror_repo_id already exists
Error: near line 138: index IDX_mirror_updated_unix already exists
Error: near line 139: index IDX_mirror_next_update_unix already exists
Error: near line 142: index IDX_release_created_unix already exists
Error: near line 143: index UQE_release_n already exists
Error: near line 144: index IDX_release_repo_id already exists
Error: near line 145: index IDX_release_publisher_id already exists
Error: near line 146: index IDX_release_tag_name already exists
Error: near line 147: index IDX_release_original_author_id already exists
Error: near line 150: index UQE_login_source_name already exists
Error: near line 151: index IDX_login_source_is_actived already exists
Error: near line 152: index IDX_login_source_is_sync_enabled already exists
Error: near line 153: index IDX_login_source_created_unix already exists
Error: near line 154: index IDX_login_source_updated_unix already exists
Error: near line 157: index IDX_webhook_repo_id already exists
Error: near line 158: index IDX_webhook_org_id already exists
Error: near line 159: index IDX_webhook_is_active already exists
Error: near line 160: index IDX_webhook_created_unix already exists
Error: near line 161: index IDX_webhook_updated_unix already exists
Error: near line 164: index IDX_hook_task_repo_id already exists
Error: near line 167: index IDX_team_org_id already exists
Error: near line 170: index IDX_org_user_uid already exists
Error: near line 171: index UQE_org_user_s already exists
Error: near line 172: index IDX_org_user_org_id already exists
Error: near line 173: index IDX_org_user_is_public already exists
Error: near line 176: index UQE_team_user_s already exists
Error: near line 177: index IDX_team_user_org_id already exists
Error: near line 180: index IDX_team_repo_org_id already exists
Error: near line 181: index UQE_team_repo_s already exists
Error: near line 184: index IDX_notice_created_unix already exists
Error: near line 187: index IDX_email_address_uid already exists
Error: near line 188: index UQE_email_address_email already exists
Error: near line 191: index IDX_notification_commit_id already exists
Error: near line 192: index IDX_notification_created_unix already exists
Error: near line 193: index IDX_notification_updated_unix already exists
Error: near line 194: index IDX_notification_repo_id already exists
Error: near line 195: index IDX_notification_status already exists
Error: near line 196: index IDX_notification_source already exists
Error: near line 197: index IDX_notification_issue_id already exists
Error: near line 198: index IDX_notification_user_id already exists
Error: near line 199: index IDX_notification_updated_by already exists
Error: near line 202: index IDX_issue_user_uid already exists
Error: near line 203: no such column: true
Error: near line 206: index UQE_lfs_meta_object_s already exists
Error: near line 207: index IDX_lfs_meta_object_oid already exists
Error: near line 208: index IDX_lfs_meta_object_repository_id already exists
Error: near line 211: index UQE_two_factor_uid already exists
Error: near line 212: index IDX_two_factor_created_unix already exists
Error: near line 213: index IDX_two_factor_updated_unix already exists
Error: near line 216: index IDX_gpg_key_owner_id already exists
Error: near line 217: index IDX_gpg_key_key_id already exists
Error: near line 222: index IDX_repo_unit_s already exists
Error: near line 223: index IDX_repo_unit_created_unix already exists
Error: near line 236: index UQE_repo_redirect_s already exists
Error: near line 237: index IDX_repo_redirect_lower_name already exists
Error: near line 240: index IDX_external_login_user_provider already exists
Error: near line 241: index IDX_external_login_user_user_id already exists
Error: near line 244: index UQE_protected_branch_s already exists
Error: near line 247: index IDX_user_open_id_uid already exists
Error: near line 248: index UQE_user_open_id_uri already exists
Error: near line 251: index UQE_issue_watch_watch already exists
Error: near line 254: index UQE_commit_status_repo_sha_index already exists
Error: near line 255: index IDX_commit_status_index already exists
Error: near line 256: index IDX_commit_status_repo_id already exists
Error: near line 257: index IDX_commit_status_sha already exists
Error: near line 258: index IDX_commit_status_context_hash already exists
Error: near line 259: index IDX_commit_status_created_unix already exists
Error: near line 260: index IDX_commit_status_updated_unix already exists
Error: near line 263: index IDX_stopwatch_issue_id already exists
Error: near line 264: index IDX_stopwatch_user_id already exists
Error: near line 267: index IDX_tracked_time_issue_id already exists
Error: near line 268: index IDX_tracked_time_user_id already exists
Error: near line 271: index IDX_deleted_branch_deleted_by_id already exists
Error: near line 272: index IDX_deleted_branch_deleted_unix already exists
Error: near line 273: index IDX_deleted_branch_repo_id already exists
Error: near line 274: index UQE_deleted_branch_s already exists
Error: near line 277: index IDX_repo_indexer_status_repo_id already exists
Error: near line 280: index UQE_issue_dependency_issue_dependency already exists
Error: near line 283: index IDX_lfs_lock_repo_id already exists
Error: near line 284: index IDX_lfs_lock_owner_id already exists
Error: near line 287: index IDX_reaction_comment_id already exists
Error: near line 288: index IDX_reaction_user_id already exists
Error: near line 289: index IDX_reaction_created_unix already exists
Error: near line 290: index IDX_reaction_type already exists
Error: near line 291: index UQE_reaction_s already exists
Error: near line 292: index IDX_reaction_issue_id already exists
Error: near line 295: index IDX_issue_assignees_assignee_id already exists
Error: near line 296: index IDX_issue_assignees_issue_id already exists
Error: near line 299: index IDX_u2f_registration_user_id already exists
Error: near line 300: index IDX_u2f_registration_created_unix already exists
Error: near line 301: index IDX_u2f_registration_updated_unix already exists
Error: near line 304: index IDX_team_unit_org_id already exists
Error: near line 305: index UQE_team_unit_s already exists
Error: near line 308: index IDX_review_updated_unix already exists
Error: near line 309: index IDX_review_reviewer_id already exists
Error: near line 310: index IDX_review_issue_id already exists
Error: near line 311: index IDX_review_created_unix already exists
Error: near line 314: index IDX_oauth2_application_uid already exists
Error: near line 315: index UQE_oauth2_application_client_id already exists
Error: near line 316: index IDX_oauth2_application_created_unix already exists
Error: near line 317: index IDX_oauth2_application_updated_unix already exists
Error: near line 320: index IDX_oauth2_authorization_code_valid_until already exists
Error: near line 321: index UQE_oauth2_authorization_code_code already exists
Error: near line 324: index UQE_oauth2_grant_user_application already exists
Error: near line 325: index IDX_oauth2_grant_user_id already exists
Error: near line 326: index IDX_oauth2_grant_application_id already exists
Error: near line 329: index IDX_task_doer_id already exists
Error: near line 330: index IDX_task_owner_id already exists
Error: near line 331: index IDX_task_repo_id already exists
Error: near line 332: index IDX_task_status already exists
Error: near line 335: index IDX_topic_updated_unix already exists
Error: near line 336: index UQE_topic_name already exists
Error: near line 337: index IDX_topic_created_unix already exists
Error: near line 340: index UQE_repo_topic_s already exists