you can try with docker.
stop influxdb on old instance:
sudo systemctl stop influxdb
copy everthing from /var/lib/influxdb
to your docker machine and map the old and the new influx data folder as volumes to the docker container:
docker run -p 8086:8086 \
-v "./influxdb-backup:/var/lib/influxdb" \
-v "./influxdb2-data:/var/lib/influxdb2" \
-e DOCKER_INFLUXDB_INIT_MODE=upgrade \
-e DOCKER_INFLUXDB_INIT_USERNAME=my-user \
-e DOCKER_INFLUXDB_INIT_PASSWORD=my-password \
-e DOCKER_INFLUXDB_INIT_ORG=my-org \
-e DOCKER_INFLUXDB_INIT_BUCKET=my-bucket \
influxdb:2.6
On first start the data will be migrated from 1.x to 2.x